source: mainline/uspace/drv/bus/pci/pciintel/pci.c@ cb94e69b

/*
 * Copyright (c) 2010 Lenka Trochtova
 * Copyright (c) 2011 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - 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.
 */

/**
 * @defgroup pciintel pci bus driver for intel method 1.
 * @brief HelenOS root pci bus driver for intel method 1.
 * @{
 */

/** @file
 */

#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include <bool.h>
#include <fibril_synch.h>
#include <str.h>
#include <ctype.h>
#include <macros.h>
#include <str_error.h>

#include <ddf/driver.h>
#include <ddf/log.h>
#include <devman.h>
#include <ipc/devman.h>
#include <ipc/dev_iface.h>
#include <ipc/irc.h>
#include <ns.h>
#include <ipc/services.h>
#include <sysinfo.h>
#include <ops/hw_res.h>
#include <device/hw_res.h>
#include <ddi.h>
#include <libarch/ddi.h>
#include <pci_dev_iface.h>

#include "pci.h"

#define NAME "pciintel"

#define CONF_ADDR(bus, dev, fn, reg) \
        ((1 << 31) | (bus << 16) | (dev << 11) | (fn << 8) | (reg & ~3))

/** Obtain PCI function soft-state from DDF function node */
#define PCI_FUN(fnode) ((pci_fun_t *) (fnode)->driver_data)

/** Obtain PCI bus soft-state from DDF device node */
#define PCI_BUS(dnode) ((pci_bus_t *) (dnode)->driver_data)

/** Obtain PCI bus soft-state from function soft-state */
#define PCI_BUS_FROM_FUN(fun) ((fun)->busptr)

static hw_resource_list_t *pciintel_get_resources(ddf_fun_t *fnode)
{
        pci_fun_t *fun = PCI_FUN(fnode);
        
        if (fun == NULL)
                return NULL;
        return &fun->hw_resources;
}

static bool pciintel_enable_interrupt(ddf_fun_t *fnode)
{
        /* This is an old ugly way, copied from ne2000 driver */
        assert(fnode);
        pci_fun_t *dev_data = (pci_fun_t *) fnode->driver_data;
        
        sysarg_t apic;
        sysarg_t i8259;
        
        async_sess_t *irc_sess = NULL;
        
        if (((sysinfo_get_value("apic", &apic) == EOK) && (apic))
            || ((sysinfo_get_value("i8259", &i8259) == EOK) && (i8259))) {
                irc_sess = service_connect_blocking(EXCHANGE_SERIALIZE,
                    SERVICE_IRC, 0, 0);
        }
        
        if (!irc_sess)
                return false;
        
        size_t i = 0;
        hw_resource_list_t *res = &dev_data->hw_resources;
        for (; i < res->count; i++) {
                if (res->resources[i].type == INTERRUPT) {
                        const int irq = res->resources[i].res.interrupt.irq;
                        
                        async_exch_t *exch = async_exchange_begin(irc_sess);
                        const int rc =
                            async_req_1_0(exch, IRC_ENABLE_INTERRUPT, irq);
                        async_exchange_end(exch);
                        
                        if (rc != EOK) {
                                async_hangup(irc_sess);
                                return false;
                        }
                }
        }
        
        async_hangup(irc_sess);
        return true;
}

static int pci_config_space_write_32(ddf_fun_t *fun, uint32_t address,
    uint32_t data)
{
        if (address > 252)
                return EINVAL;
        pci_conf_write_32(PCI_FUN(fun), address, data);
        return EOK;
}

static int pci_config_space_write_16(
    ddf_fun_t *fun, uint32_t address, uint16_t data)
{
        if (address > 254)
                return EINVAL;
        pci_conf_write_16(PCI_FUN(fun), address, data);
        return EOK;
}

static int pci_config_space_write_8(
    ddf_fun_t *fun, uint32_t address, uint8_t data)
{
        if (address > 255)
                return EINVAL;
        pci_conf_write_8(PCI_FUN(fun), address, data);
        return EOK;
}

static int pci_config_space_read_32(
    ddf_fun_t *fun, uint32_t address, uint32_t *data)
{
        if (address > 252)
                return EINVAL;
        *data = pci_conf_read_32(PCI_FUN(fun), address);
        return EOK;
}

static int pci_config_space_read_16(
    ddf_fun_t *fun, uint32_t address, uint16_t *data)
{
        if (address > 254)
                return EINVAL;
        *data = pci_conf_read_16(PCI_FUN(fun), address);
        return EOK;
}

static int pci_config_space_read_8(
    ddf_fun_t *fun, uint32_t address, uint8_t *data)
{
        if (address > 255)
                return EINVAL;
        *data = pci_conf_read_8(PCI_FUN(fun), address);
        return EOK;
}

static hw_res_ops_t pciintel_hw_res_ops = {
        &pciintel_get_resources,
        &pciintel_enable_interrupt
};

static pci_dev_iface_t pci_dev_ops = {
        .config_space_read_8 = &pci_config_space_read_8,
        .config_space_read_16 = &pci_config_space_read_16,
        .config_space_read_32 = &pci_config_space_read_32,
        .config_space_write_8 = &pci_config_space_write_8,
        .config_space_write_16 = &pci_config_space_write_16,
        .config_space_write_32 = &pci_config_space_write_32
};

static ddf_dev_ops_t pci_fun_ops = {
        .interfaces[HW_RES_DEV_IFACE] = &pciintel_hw_res_ops,
        .interfaces[PCI_DEV_IFACE] = &pci_dev_ops
};

static int pci_add_device(ddf_dev_t *);
static int pci_fun_online(ddf_fun_t *);
static int pci_fun_offline(ddf_fun_t *);

/** PCI bus driver standard operations */
static driver_ops_t pci_ops = {
        .add_device = &pci_add_device,
        .fun_online = &pci_fun_online,
        .fun_offline = &pci_fun_offline,
};

/** PCI bus driver structure */
static driver_t pci_driver = {
        .name = NAME,
        .driver_ops = &pci_ops
};

static void pci_conf_read(pci_fun_t *fun, int reg, uint8_t *buf, size_t len)
{
        pci_bus_t *bus = PCI_BUS_FROM_FUN(fun);
        
        fibril_mutex_lock(&bus->conf_mutex);
        
        const uint32_t conf_addr = CONF_ADDR(fun->bus, fun->dev, fun->fn, reg);
        void *addr = bus->conf_data_port + (reg & 3);
        
        pio_write_32(bus->conf_addr_port, conf_addr);
        
        switch (len) {
        case 1:
                buf[0] = pio_read_8(addr);
                break;
        case 2:
                ((uint16_t *) buf)[0] = pio_read_16(addr);
                break;
        case 4:
                ((uint32_t *) buf)[0] = pio_read_32(addr);
                break;
        }
        
        fibril_mutex_unlock(&bus->conf_mutex);
}

static void pci_conf_write(pci_fun_t *fun, int reg, uint8_t *buf, size_t len)
{
        pci_bus_t *bus = PCI_BUS_FROM_FUN(fun);
        
        fibril_mutex_lock(&bus->conf_mutex);
        
        uint32_t conf_addr;
        conf_addr = CONF_ADDR(fun->bus, fun->dev, fun->fn, reg);
        void *addr = bus->conf_data_port + (reg & 3);
        
        pio_write_32(bus->conf_addr_port, conf_addr);
        
        switch (len) {
        case 1:
                pio_write_8(addr, buf[0]);
                break;
        case 2:
                pio_write_16(addr, ((uint16_t *) buf)[0]);
                break;
        case 4:
                pio_write_32(addr, ((uint32_t *) buf)[0]);
                break;
        }
        
        fibril_mutex_unlock(&bus->conf_mutex);
}

uint8_t pci_conf_read_8(pci_fun_t *fun, int reg)
{
        uint8_t res;
        pci_conf_read(fun, reg, &res, 1);
        return res;
}

uint16_t pci_conf_read_16(pci_fun_t *fun, int reg)
{
        uint16_t res;
        pci_conf_read(fun, reg, (uint8_t *) &res, 2);
        return res;
}

uint32_t pci_conf_read_32(pci_fun_t *fun, int reg)
{
        uint32_t res;
        pci_conf_read(fun, reg, (uint8_t *) &res, 4);
        return res;
}

void pci_conf_write_8(pci_fun_t *fun, int reg, uint8_t val)
{
        pci_conf_write(fun, reg, (uint8_t *) &val, 1);
}

void pci_conf_write_16(pci_fun_t *fun, int reg, uint16_t val)
{
        pci_conf_write(fun, reg, (uint8_t *) &val, 2);
}

void pci_conf_write_32(pci_fun_t *fun, int reg, uint32_t val)
{
        pci_conf_write(fun, reg, (uint8_t *) &val, 4);
}

void pci_fun_create_match_ids(pci_fun_t *fun)
{
#define ID_MAX_STR_LEN 50 /* Max is 47, align to something nice. */

        int rc;
        char match_id_str[ID_MAX_STR_LEN];

        /* Vendor ID & Device ID, length(incl \0) 22 */
        rc = snprintf(match_id_str, ID_MAX_STR_LEN, "pci/ven=%04x&dev=%04x",
            fun->vendor_id, fun->device_id);
        if (rc < 0) {
                ddf_msg(LVL_ERROR, "Failed creating match ID str: %s",
                    str_error(rc));
        }

        rc = ddf_fun_add_match_id(fun->fnode, match_id_str, 90);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "Failed adding match ID: %s", str_error(rc));
        }

        /* Class, subclass, prog IF, revision, length(incl \0) 47 */
        rc = snprintf(match_id_str, ID_MAX_STR_LEN,
            "pci/class=%02x&subclass=%02x&progif=%02x&revision=%02x",
            fun->class_code, fun->subclass_code, fun->prog_if, fun->revision);
        if (rc < 0) {
                ddf_msg(LVL_ERROR, "Failed creating match ID str: %s",
                    str_error(rc));
        }

        rc = ddf_fun_add_match_id(fun->fnode, match_id_str, 70);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "Failed adding match ID: %s", str_error(rc));
        }

        /* Class, subclass, prog IF, length(incl \0) 35 */
        rc = snprintf(match_id_str, ID_MAX_STR_LEN,
            "pci/class=%02x&subclass=%02x&progif=%02x",
            fun->class_code, fun->subclass_code, fun->prog_if);
        if (rc < 0) {
                ddf_msg(LVL_ERROR, "Failed creating match ID str: %s",
                    str_error(rc));
        }

        rc = ddf_fun_add_match_id(fun->fnode, match_id_str, 60);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "Failed adding match ID: %s", str_error(rc));
        }

        /* Class, subclass, length(incl \0) 25 */
        rc = snprintf(match_id_str, ID_MAX_STR_LEN,
            "pci/class=%02x&subclass=%02x",
            fun->class_code, fun->subclass_code);
        if (rc < 0) {
                ddf_msg(LVL_ERROR, "Failed creating match ID str: %s",
                    str_error(rc));
        }

        rc = ddf_fun_add_match_id(fun->fnode, match_id_str, 50);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "Failed adding match ID: %s", str_error(rc));
        }

        /* Class, length(incl \0) 13 */
        rc = snprintf(match_id_str, ID_MAX_STR_LEN, "pci/class=%02x",
            fun->class_code);
        if (rc < 0) {
                ddf_msg(LVL_ERROR, "Failed creating match ID str: %s",
                    str_error(rc));
        }

        rc = ddf_fun_add_match_id(fun->fnode, match_id_str, 40);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "Failed adding match ID: %s", str_error(rc));
        }

        /* TODO add subsys ids, but those exist only in header type 0 */
}

void pci_add_range(pci_fun_t *fun, uint64_t range_addr, size_t range_size,
    bool io)
{
        hw_resource_list_t *hw_res_list = &fun->hw_resources;
        hw_resource_t *hw_resources =  hw_res_list->resources;
        size_t count = hw_res_list->count;
        
        assert(hw_resources != NULL);
        assert(count < PCI_MAX_HW_RES);
        
        if (io) {
                hw_resources[count].type = IO_RANGE;
                hw_resources[count].res.io_range.address = range_addr;
                hw_resources[count].res.io_range.size = range_size;
                hw_resources[count].res.io_range.endianness = LITTLE_ENDIAN;
        } else {
                hw_resources[count].type = MEM_RANGE;
                hw_resources[count].res.mem_range.address = range_addr;
                hw_resources[count].res.mem_range.size = range_size;
                hw_resources[count].res.mem_range.endianness = LITTLE_ENDIAN;
        }
        
        hw_res_list->count++;
}

/** Read the base address register (BAR) of the device and if it contains valid
 * address add it to the devices hw resource list.
 *
 * @param fun   PCI function
 * @param addr  The address of the BAR in the PCI configuration address space of
 *              the device
 * @return      The addr the address of the BAR which should be read next
 */
int pci_read_bar(pci_fun_t *fun, int addr)
{
        /* Value of the BAR */
        uint32_t val, mask;
        /* IO space address */
        bool io;
        /* 64-bit wide address */
        bool addrw64;
        
        /* Size of the io or memory range specified by the BAR */
        size_t range_size;
        /* Beginning of the io or memory range specified by the BAR */
        uint64_t range_addr;
        
        /* Get the value of the BAR. */
        val = pci_conf_read_32(fun, addr);

#define IO_MASK  (~0x3)
#define MEM_MASK (~0xf)
        
        io = (bool) (val & 1);
        if (io) {
                addrw64 = false;
                mask = IO_MASK;
        } else {
                mask = MEM_MASK;
                switch ((val >> 1) & 3) {
                case 0:
                        addrw64 = false;
                        break;
                case 2:
                        addrw64 = true;
                        break;
                default:
                        /* reserved, go to the next BAR */
                        return addr + 4;
                }
        }
        
        /* Get the address mask. */
        pci_conf_write_32(fun, addr, 0xffffffff);
        mask &= pci_conf_read_32(fun, addr);
        
        /* Restore the original value. */
        pci_conf_write_32(fun, addr, val);
        val = pci_conf_read_32(fun, addr);
        
        range_size = pci_bar_mask_to_size(mask);
        
        if (addrw64) {
                range_addr = ((uint64_t)pci_conf_read_32(fun, addr + 4) << 32) |
                    (val & 0xfffffff0);
        } else {
                range_addr = (val & 0xfffffff0);
        }
        
        if (range_addr != 0) {
                ddf_msg(LVL_DEBUG, "Function %s : address = %" PRIx64
                    ", size = %x", fun->fnode->name, range_addr,
                    (unsigned int) range_size);
        }
        
        pci_add_range(fun, range_addr, range_size, io);
        
        if (addrw64)
                return addr + 8;
        
        return addr + 4;
}

void pci_add_interrupt(pci_fun_t *fun, int irq)
{
        hw_resource_list_t *hw_res_list = &fun->hw_resources;
        hw_resource_t *hw_resources = hw_res_list->resources;
        size_t count = hw_res_list->count;
        
        assert(NULL != hw_resources);
        assert(count < PCI_MAX_HW_RES);
        
        hw_resources[count].type = INTERRUPT;
        hw_resources[count].res.interrupt.irq = irq;
        
        hw_res_list->count++;
        
        ddf_msg(LVL_NOTE, "Function %s uses irq %x.", fun->fnode->name, irq);
}

void pci_read_interrupt(pci_fun_t *fun)
{
        uint8_t irq = pci_conf_read_8(fun, PCI_BRIDGE_INT_LINE);
        if (irq != 0xff)
                pci_add_interrupt(fun, irq);
}

/** Enumerate (recursively) and register the devices connected to a pci bus.
 *
 * @param bus           Host-to-PCI bridge
 * @param bus_num       Bus number
 */
void pci_bus_scan(pci_bus_t *bus, int bus_num) 
{
        ddf_fun_t *fnode;
        pci_fun_t *fun;
        
        int child_bus = 0;
        int dnum, fnum;
        bool multi;
        uint8_t header_type;
        
        fun = pci_fun_new(bus);
        
        for (dnum = 0; dnum < 32; dnum++) {
                multi = true;
                for (fnum = 0; multi && fnum < 8; fnum++) {
                        pci_fun_init(fun, bus_num, dnum, fnum);
                        if (fun->vendor_id == 0xffff) {
                                /*
                                 * The device is not present, go on scanning the
                                 * bus.
                                 */
                                if (fnum == 0)
                                        break;
                                else
                                        continue;
                        }
                        
                        header_type = pci_conf_read_8(fun, PCI_HEADER_TYPE);
                        if (fnum == 0) {
                                /* Is the device multifunction? */
                                multi = header_type >> 7;
                        }
                        /* Clear the multifunction bit. */
                        header_type = header_type & 0x7F;
                        
                        char *fun_name = pci_fun_create_name(fun);
                        if (fun_name == NULL) {
                                ddf_msg(LVL_ERROR, "Out of memory.");
                                return;
                        }
                        
                        fnode = ddf_fun_create(bus->dnode, fun_inner, fun_name);
                        free(fun_name);
                        if (fnode == NULL) {
                                ddf_msg(LVL_ERROR, "Failed creating function.");
                                return;
                        }
                        
                        fun->fnode = fnode;
                        
                        pci_alloc_resource_list(fun);
                        pci_read_bars(fun);
                        pci_read_interrupt(fun);
                        
                        fnode->ops = &pci_fun_ops;
                        fnode->driver_data = fun;
                        
                        ddf_msg(LVL_DEBUG, "Adding new function %s.",
                            fnode->name);
                        
                        pci_fun_create_match_ids(fun);
                        
                        if (ddf_fun_bind(fnode) != EOK) {
                                pci_clean_resource_list(fun);
                                clean_match_ids(&fnode->match_ids);
                                free((char *) fnode->name);
                                fnode->name = NULL;
                                continue;
                        }
                        
                        if (header_type == PCI_HEADER_TYPE_BRIDGE ||
                            header_type == PCI_HEADER_TYPE_CARDBUS) {
                                child_bus = pci_conf_read_8(fun,
                                    PCI_BRIDGE_SEC_BUS_NUM);
                                ddf_msg(LVL_DEBUG, "Device is pci-to-pci "
                                    "bridge, secondary bus number = %d.",
                                    bus_num);
                                if (child_bus > bus_num)
                                        pci_bus_scan(bus, child_bus);
                        }
                        
                        fun = pci_fun_new(bus);
                }
        }
        
        if (fun->vendor_id == 0xffff) {
                /* Free the auxiliary function structure. */
                pci_fun_delete(fun);
        }
}

static int pci_add_device(ddf_dev_t *dnode)
{
        pci_bus_t *bus = NULL;
        ddf_fun_t *ctl = NULL;
        bool got_res = false;
        int rc;
        
        ddf_msg(LVL_DEBUG, "pci_add_device");
        dnode->parent_sess = NULL;
        
        bus = ddf_dev_data_alloc(dnode, sizeof(pci_bus_t));
        if (bus == NULL) {
                ddf_msg(LVL_ERROR, "pci_add_device allocation failed.");
                rc = ENOMEM;
                goto fail;
        }
        fibril_mutex_initialize(&bus->conf_mutex);

        bus->dnode = dnode;
        dnode->driver_data = bus;
        
        dnode->parent_sess = devman_parent_device_connect(EXCHANGE_SERIALIZE,
            dnode->handle, IPC_FLAG_BLOCKING);
        if (!dnode->parent_sess) {
                ddf_msg(LVL_ERROR, "pci_add_device failed to connect to the "
                    "parent driver.");
                rc = ENOENT;
                goto fail;
        }
        
        hw_resource_list_t hw_resources;
        
        rc = hw_res_get_resource_list(dnode->parent_sess, &hw_resources);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "pci_add_device failed to get hw resources "
                    "for the device.");
                goto fail;
        }
        got_res = true;
        
        ddf_msg(LVL_DEBUG, "conf_addr = %" PRIx64 ".",
            hw_resources.resources[0].res.io_range.address);
        
        assert(hw_resources.count > 0);
        assert(hw_resources.resources[0].type == IO_RANGE);
        assert(hw_resources.resources[0].res.io_range.size == 8);
        
        bus->conf_io_addr =
            (uint32_t) hw_resources.resources[0].res.io_range.address;
        
        if (pio_enable((void *)(uintptr_t)bus->conf_io_addr, 8,
            &bus->conf_addr_port)) {
                ddf_msg(LVL_ERROR, "Failed to enable configuration ports.");
                rc = EADDRNOTAVAIL;
                goto fail;
        }
        bus->conf_data_port = (char *) bus->conf_addr_port + 4;
        
        /* Make the bus device more visible. It has no use yet. */
        ddf_msg(LVL_DEBUG, "Adding a 'ctl' function");
        
        ctl = ddf_fun_create(bus->dnode, fun_exposed, "ctl");
        if (ctl == NULL) {
                ddf_msg(LVL_ERROR, "Failed creating control function.");
                rc = ENOMEM;
                goto fail;
        }
        
        rc = ddf_fun_bind(ctl);
        if (rc != EOK) {
                ddf_msg(LVL_ERROR, "Failed binding control function.");
                goto fail;
        }
        
        /* Enumerate functions. */
        ddf_msg(LVL_DEBUG, "Scanning the bus");
        pci_bus_scan(bus, 0);
        
        hw_res_clean_resource_list(&hw_resources);
        
        return EOK;
        
fail:
        if (dnode->parent_sess)
                async_hangup(dnode->parent_sess);
        
        if (got_res)
                hw_res_clean_resource_list(&hw_resources);
        
        if (ctl != NULL)
                ddf_fun_destroy(ctl);
        
        return rc;
}

static int pci_fun_online(ddf_fun_t *fun)
{
        ddf_msg(LVL_DEBUG, "pci_fun_online()");
        return ddf_fun_online(fun);
}

static int pci_fun_offline(ddf_fun_t *fun)
{
        ddf_msg(LVL_DEBUG, "pci_fun_offline()");
        return ddf_fun_offline(fun);
}

static void pciintel_init(void)
{
        ddf_log_init(NAME, LVL_ERROR);
        pci_fun_ops.interfaces[HW_RES_DEV_IFACE] = &pciintel_hw_res_ops;
        pci_fun_ops.interfaces[PCI_DEV_IFACE] = &pci_dev_ops;
}

pci_fun_t *pci_fun_new(pci_bus_t *bus)
{
        pci_fun_t *fun;
        
        fun = (pci_fun_t *) calloc(1, sizeof(pci_fun_t));
        if (fun == NULL)
                return NULL;

        fun->busptr = bus;
        return fun;
}

void pci_fun_init(pci_fun_t *fun, int bus, int dev, int fn)
{
        fun->bus = bus;
        fun->dev = dev;
        fun->fn = fn;
        fun->vendor_id = pci_conf_read_16(fun, PCI_VENDOR_ID);
        fun->device_id = pci_conf_read_16(fun, PCI_DEVICE_ID);
        fun->class_code = pci_conf_read_8(fun, PCI_BASE_CLASS);
        fun->subclass_code = pci_conf_read_8(fun, PCI_SUB_CLASS);
        fun->prog_if = pci_conf_read_8(fun, PCI_PROG_IF);
        fun->revision = pci_conf_read_8(fun, PCI_REVISION_ID);
}

void pci_fun_delete(pci_fun_t *fun)
{
        assert(fun != NULL);
        hw_res_clean_resource_list(&fun->hw_resources);
        free(fun);
}

char *pci_fun_create_name(pci_fun_t *fun)
{
        char *name = NULL;
        
        asprintf(&name, "%02x:%02x.%01x", fun->bus, fun->dev,
            fun->fn);
        return name;
}

bool pci_alloc_resource_list(pci_fun_t *fun)
{
        fun->hw_resources.resources = fun->resources;
        return true;
}

void pci_clean_resource_list(pci_fun_t *fun)
{
        fun->hw_resources.resources = NULL;
}

/** Read the base address registers (BARs) of the function and add the addresses
 * to its HW resource list.
 *
 * @param fun   PCI function
 */
void pci_read_bars(pci_fun_t *fun)
{
        /*
         * Position of the BAR in the PCI configuration address space of the
         * device.
         */
        int addr = PCI_BASE_ADDR_0;
        
        while (addr <= PCI_BASE_ADDR_5)
                addr = pci_read_bar(fun, addr);
}

size_t pci_bar_mask_to_size(uint32_t mask)
{
        size_t size = mask & ~(mask - 1);
        return size;
}

int main(int argc, char *argv[])
{
        printf(NAME ": HelenOS PCI bus driver (Intel method 1).\n");
        pciintel_init();
        return ddf_driver_main(&pci_driver);
}

/**
 * @}
 */