/*
 *	The PCI Library -- Generic Direct Access Functions
 *
 *	Copyright (c) 1997--2000 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 <string.h>

#include "internal.h"

void pci_generic_scan_bus(struct pci_access *a, byte * busmap, int bus)
{
	int dev, multi, ht;
	struct pci_dev *t;

	a->debug("Scanning bus %02x for devices...\n", bus);
	if (busmap[bus]) {
		a->warning("Bus %02x seen twice (firmware bug). Ignored.",
			   bus);
		return;
	}
	busmap[bus] = 1;
	t = pci_alloc_dev(a);
	t->bus = bus;
	for (dev = 0; dev < 32; dev++) {
		t->dev = dev;
		multi = 0;
		for (t->func = 0; !t->func || (multi && t->func < 8);
		     t->func++) {
			u32 vd = pci_read_long(t, PCI_VENDOR_ID);
			struct pci_dev *d;

			if (!vd || vd == 0xffffffff)
				continue;
			ht = pci_read_byte(t, PCI_HEADER_TYPE);
			if (!t->func)
				multi = ht & 0x80;
			ht &= 0x7f;
			d = pci_alloc_dev(a);
			d->bus = t->bus;
			d->dev = t->dev;
			d->func = t->func;
			d->vendor_id = vd & 0xffff;
			d->device_id = vd >> 16U;
			d->known_fields = PCI_FILL_IDENT;
			d->hdrtype = ht;
			pci_link_dev(a, d);
			switch (ht) {
			case PCI_HEADER_TYPE_NORMAL:
				break;
			case PCI_HEADER_TYPE_BRIDGE:
			case PCI_HEADER_TYPE_CARDBUS:
				pci_generic_scan_bus(a, busmap,
						     pci_read_byte(t,
								   PCI_SECONDARY_BUS));
				break;
			default:
				a->debug
				    ("Device %04x:%02x:%02x.%d has unknown header type %02x.\n",
				     d->domain, d->bus, d->dev, d->func,
				     ht);
			}
		}
	}
	pci_free_dev(t);
}

void pci_generic_scan(struct pci_access *a)
{
	byte busmap[256];

	bzero(busmap, sizeof(busmap));
	pci_generic_scan_bus(a, busmap, 0);
}

int pci_generic_fill_info(struct pci_dev *d, int flags)
{
	struct pci_access *a = d->access;

	if ((flags & (PCI_FILL_BASES | PCI_FILL_ROM_BASE))
	    && d->hdrtype < 0)
		d->hdrtype = pci_read_byte(d, PCI_HEADER_TYPE) & 0x7f;
	if (flags & PCI_FILL_IDENT) {
		d->vendor_id = pci_read_word(d, PCI_VENDOR_ID);
		d->device_id = pci_read_word(d, PCI_DEVICE_ID);
	}
	if (flags & PCI_FILL_IRQ)
		d->irq = pci_read_byte(d, PCI_INTERRUPT_LINE);
	if (flags & PCI_FILL_BASES) {
		int cnt = 0, i;
		bzero(d->base_addr, sizeof(d->base_addr));
		switch (d->hdrtype) {
		case PCI_HEADER_TYPE_NORMAL:
			cnt = 6;
			break;
		case PCI_HEADER_TYPE_BRIDGE:
			cnt = 2;
			break;
		case PCI_HEADER_TYPE_CARDBUS:
			cnt = 1;
			break;
		}
		if (cnt) {
			for (i = 0; i < cnt; i++) {
				u32 x = pci_read_long(d, PCI_BASE_ADDRESS_0 + i * 4);
				if (!x || x == (u32) ~ 0)
					continue;
				if ((x & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO)
					d->base_addr[i] = x;
				else {
					if ((x & PCI_BASE_ADDRESS_MEM_TYPE_MASK) != PCI_BASE_ADDRESS_MEM_TYPE_64)
						d->base_addr[i] = x;
					else if (i >= cnt - 1)
						a->warning("%04x:%02x:%02x.%d: Invalid 64-bit address seen for BAR %d.",
						     d->domain, d->bus,
						     d->dev, d->func, i);
					else {
						u32 y = pci_read_long(d, PCI_BASE_ADDRESS_0 + (++i) * 4);
#ifdef PCI_HAVE_64BIT_ADDRESS
						d->base_addr[i - 1] = x | (((pciaddr_t) y) << 32);
#else
						if (y)
							a->warning("%04x:%02x:%02x.%d 64-bit device address ignored.",
							     d->domain,
							     d->bus,
							     d->dev,
							     d->func);
						else
							d->base_addr[i - 1] = x;
#endif
					}
				}
			}
		}
	}
	if (flags & PCI_FILL_ROM_BASE) {
		int reg = 0;
		d->rom_base_addr = 0;
		switch (d->hdrtype) {
		case PCI_HEADER_TYPE_NORMAL:
			reg = PCI_ROM_ADDRESS;
			break;
		case PCI_HEADER_TYPE_BRIDGE:
			reg = PCI_ROM_ADDRESS1;
			break;
		}
		if (reg) {
			u32 u = pci_read_long(d, reg);
			if (u != 0xffffffff)
				d->rom_base_addr = u;
		}
	}
	return flags & ~PCI_FILL_SIZES;
}

static int
pci_generic_block_op(struct pci_dev *d, int pos, byte * buf, int len,
		     int (*r) (struct pci_dev * d, int pos, byte * buf,
			       int len))
{
	if ((pos & 1) && len >= 1) {
		if (!r(d, pos, buf, 1))
			return 0;
		pos++;
		buf++;
		len--;
	}
	if ((pos & 3) && len >= 2) {
		if (!r(d, pos, buf, 2))
			return 0;
		pos += 2;
		buf += 2;
		len -= 2;
	}
	while (len >= 4) {
		if (!r(d, pos, buf, 4))
			return 0;
		pos += 4;
		buf += 4;
		len -= 4;
	}
	if (len >= 2) {
		if (!r(d, pos, buf, 2))
			return 0;
		pos += 2;
		buf += 2;
		len -= 2;
	}
	if (len && !r(d, pos, buf, 1))
		return 0;
	return 1;
}

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

int pci_generic_block_write(struct pci_dev *d, int pos, byte * buf, int len)
{
	return pci_generic_block_op(d, pos, buf, len, d->access->methods->write);
}
