source: mainline/uspace/lib/libpci/access.c@ e5773c6

/*
 *      The PCI Library -- User Access
 *
 *      Copyright (c) 1997--2003 Martin Mares <mj@ucw.cz>
 *
 *      May 8, 2006 - Modified and ported to HelenOS by Jakub Jermar.
 *
 *      Can be freely distributed and used under the terms of the GNU GPL.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>

#include "internal.h"

static struct pci_methods *pci_methods[PCI_ACCESS_MAX] = {
        &pm_intel_conf1,
        &pm_intel_conf2,
};

struct pci_access *pci_alloc(void)
{
        struct pci_access *a = malloc(sizeof(struct pci_access));
        int i;

        if (!a)
                return NULL;
                
        bzero(a, sizeof(*a));
        for (i = 0; i < PCI_ACCESS_MAX; i++)
                if (pci_methods[i] && pci_methods[i]->config)
                        pci_methods[i]->config(a);
        return a;
}

void *pci_malloc(struct pci_access *a, int size)
{
        void *x = malloc(size);

        if (!x)
                a->error("Out of memory (allocation of %d bytes failed)", size);
        return x;
}

void pci_mfree(void *x)
{
        if (x)
                free(x);
}

static void pci_generic_error(char *msg, ...)
{
        va_list args;

        va_start(args, msg);
        puts("pcilib: ");
        vprintf(msg, args);
        putchar('\n');
        exit(1);
}

static void pci_generic_warn(char *msg, ...)
{
        va_list args;

        va_start(args, msg);
        puts("pcilib: ");
        vprintf(msg, args);
        putchar('\n');
}

static void pci_generic_debug(char *msg, ...)
{
        va_list args;

        va_start(args, msg);
        vprintf(msg, args);
        va_end(args);
}

static void pci_null_debug(char *msg UNUSED, ...)
{
}

void pci_init(struct pci_access *a)
{
        if (!a->error)
                a->error = pci_generic_error;
        if (!a->warning)
                a->warning = pci_generic_warn;
        if (!a->debug)
                a->debug = pci_generic_debug;
        if (!a->debugging)
                a->debug = pci_null_debug;

        if (a->method) {
                if (a->method >= PCI_ACCESS_MAX || !pci_methods[a->method])
                        a->error("This access method is not supported.");
                a->methods = pci_methods[a->method];
        } else {
                unsigned int i;
                for (i = 0; i < PCI_ACCESS_MAX; i++)
                        if (pci_methods[i]) {
                                a->debug("Trying method %d...", i);
                                if (pci_methods[i]->detect(a)) {
                                        a->debug("...OK\n");
                                        a->methods = pci_methods[i];
                                        a->method = i;
                                        break;
                                }
                                a->debug("...No.\n");
                        }
                if (!a->methods)
                        a->error("Cannot find any working access method.");
        }
        a->debug("Decided to use %s\n", a->methods->name);
        a->methods->init(a);
}

void pci_cleanup(struct pci_access *a)
{
        struct pci_dev *d, *e;

        for (d = a->devices; d; d = e) {
                e = d->next;
                pci_free_dev(d);
        }
        if (a->methods)
                a->methods->cleanup(a);
        pci_free_name_list(a);
        pci_mfree(a);
}

void pci_scan_bus(struct pci_access *a)
{
        a->methods->scan(a);
}

struct pci_dev *pci_alloc_dev(struct pci_access *a)
{
        struct pci_dev *d = pci_malloc(a, sizeof(struct pci_dev));

        bzero(d, sizeof(*d));
        d->access = a;
        d->methods = a->methods;
        d->hdrtype = -1;
        if (d->methods->init_dev)
                d->methods->init_dev(d);
        return d;
}

int pci_link_dev(struct pci_access *a, struct pci_dev *d)
{
        d->next = a->devices;
        a->devices = d;

        return 1;
}

struct pci_dev *pci_get_dev(struct pci_access *a, int domain, int bus,
                            int dev, int func)
{
        struct pci_dev *d = pci_alloc_dev(a);

        d->domain = domain;
        d->bus = bus;
        d->dev = dev;
        d->func = func;
        return d;
}

void pci_free_dev(struct pci_dev *d)
{
        if (d->methods->cleanup_dev)
                d->methods->cleanup_dev(d);
        pci_mfree(d);
}

static inline void
pci_read_data(struct pci_dev *d, void *buf, int pos, int len)
{
        if (pos & (len - 1))
                d->access->error("Unaligned read: pos=%02x, len=%d", pos,
                                 len);
        if (pos + len <= d->cache_len)
                memcpy(buf, d->cache + pos, len);
        else if (!d->methods->read(d, pos, buf, len))
                memset(buf, 0xff, len);
}

byte pci_read_byte(struct pci_dev *d, int pos)
{
        byte buf;
        pci_read_data(d, &buf, pos, 1);
        return buf;
}

word pci_read_word(struct pci_dev * d, int pos)
{
        word buf;
        pci_read_data(d, &buf, pos, 2);
        return le16_to_cpu(buf);
}

u32 pci_read_long(struct pci_dev * d, int pos)
{
        u32 buf;
        pci_read_data(d, &buf, pos, 4);
        return le32_to_cpu(buf);
}

int pci_read_block(struct pci_dev *d, int pos, byte * buf, int len)
{
        return d->methods->read(d, pos, buf, len);
}

static inline int
pci_write_data(struct pci_dev *d, void *buf, int pos, int len)
{
        if (pos & (len - 1))
                d->access->error("Unaligned write: pos=%02x,len=%d", pos, len);
        if (pos + len <= d->cache_len)
                memcpy(d->cache + pos, buf, len);
        return d->methods->write(d, pos, buf, len);
}

int pci_write_byte(struct pci_dev *d, int pos, byte data)
{
        return pci_write_data(d, &data, pos, 1);
}

int pci_write_word(struct pci_dev *d, int pos, word data)
{
        word buf = cpu_to_le16(data);
        return pci_write_data(d, &buf, pos, 2);
}

int pci_write_long(struct pci_dev *d, int pos, u32 data)
{
        u32 buf = cpu_to_le32(data);
        return pci_write_data(d, &buf, pos, 4);
}

int pci_write_block(struct pci_dev *d, int pos, byte * buf, int len)
{
        if (pos < d->cache_len) {
                int l = (pos + len >= d->cache_len) ? (d->cache_len - pos) : len;
                memcpy(d->cache + pos, buf, l);
        }
        return d->methods->write(d, pos, buf, len);
}

int pci_fill_info(struct pci_dev *d, int flags)
{
        if (flags & PCI_FILL_RESCAN) {
                flags &= ~PCI_FILL_RESCAN;
                d->known_fields = 0;
        }
        if (flags & ~d->known_fields)
                d->known_fields |= d->methods->fill_info(d, flags & ~d->known_fields);
        return d->known_fields;
}

void pci_setup_cache(struct pci_dev *d, byte * cache, int len)
{
        d->cache = cache;
        d->cache_len = len;
}