pci-uclass.c

/*
 * Copyright (c) 2014 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <inttypes.h>
#include <pci.h>
#include <asm/io.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
#if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
#include <asm/fsp/fsp_support.h>
#endif
#include "pci_internal.h"

DECLARE_GLOBAL_DATA_PTR;

int pci_get_bus(int busnum, struct udevice **busp)
{
	int ret;

	ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, busp);

	/* Since buses may not be numbered yet try a little harder with bus 0 */
	if (ret == -ENODEV) {
		ret = uclass_first_device_err(UCLASS_PCI, busp);
		if (ret)
			return ret;
		ret = uclass_get_device_by_seq(UCLASS_PCI, busnum, busp);
	}

	return ret;
}

struct udevice *pci_get_controller(struct udevice *dev)
{
	while (device_is_on_pci_bus(dev))
		dev = dev->parent;

	return dev;
}

pci_dev_t dm_pci_get_bdf(struct udevice *dev)
{
	struct pci_child_platdata *pplat = dev_get_parent_platdata(dev);
	struct udevice *bus = dev->parent;

	return PCI_ADD_BUS(bus->seq, pplat->devfn);
}

/**
 * pci_get_bus_max() - returns the bus number of the last active bus
 *
 * @return last bus number, or -1 if no active buses
 */
static int pci_get_bus_max(void)
{
	struct udevice *bus;
	struct uclass *uc;
	int ret = -1;

	ret = uclass_get(UCLASS_PCI, &uc);
	uclass_foreach_dev(bus, uc) {
		if (bus->seq > ret)
			ret = bus->seq;
	}

	debug("%s: ret=%d\n", __func__, ret);

	return ret;
}

int pci_last_busno(void)
{
	return pci_get_bus_max();
}

int pci_get_ff(enum pci_size_t size)
{
	switch (size) {
	case PCI_SIZE_8:
		return 0xff;
	case PCI_SIZE_16:
		return 0xffff;
	default:
		return 0xffffffff;
	}
}

int pci_bus_find_devfn(struct udevice *bus, pci_dev_t find_devfn,
		       struct udevice **devp)
{
	struct udevice *dev;

	for (device_find_first_child(bus, &dev);
	     dev;
	     device_find_next_child(&dev)) {
		struct pci_child_platdata *pplat;

		pplat = dev_get_parent_platdata(dev);
		if (pplat && pplat->devfn == find_devfn) {
			*devp = dev;
			return 0;
		}
	}

	return -ENODEV;
}

int dm_pci_bus_find_bdf(pci_dev_t bdf, struct udevice **devp)
{
	struct udevice *bus;
	int ret;

	ret = pci_get_bus(PCI_BUS(bdf), &bus);
	if (ret)
		return ret;
	return pci_bus_find_devfn(bus, PCI_MASK_BUS(bdf), devp);
}

static int pci_device_matches_ids(struct udevice *dev,
				  struct pci_device_id *ids)
{
	struct pci_child_platdata *pplat;
	int i;

	pplat = dev_get_parent_platdata(dev);
	if (!pplat)
		return -EINVAL;
	for (i = 0; ids[i].vendor != 0; i++) {
		if (pplat->vendor == ids[i].vendor &&
		    pplat->device == ids[i].device)
			return i;
	}

	return -EINVAL;
}

int pci_bus_find_devices(struct udevice *bus, struct pci_device_id *ids,
			 int *indexp, struct udevice **devp)
{
	struct udevice *dev;

	/* Scan all devices on this bus */
	for (device_find_first_child(bus, &dev);
	     dev;
	     device_find_next_child(&dev)) {
		if (pci_device_matches_ids(dev, ids) >= 0) {
			if ((*indexp)-- <= 0) {
				*devp = dev;
				return 0;
			}
		}
	}

	return -ENODEV;
}

int pci_find_device_id(struct pci_device_id *ids, int index,
		       struct udevice **devp)
{
	struct udevice *bus;

	/* Scan all known buses */
	for (uclass_first_device(UCLASS_PCI, &bus);
	     bus;
	     uclass_next_device(&bus)) {
		if (!pci_bus_find_devices(bus, ids, &index, devp))
			return 0;
	}
	*devp = NULL;

	return -ENODEV;
}

static int dm_pci_bus_find_device(struct udevice *bus, unsigned int vendor,
				  unsigned int device, int *indexp,
				  struct udevice **devp)
{
	struct pci_child_platdata *pplat;
	struct udevice *dev;

	for (device_find_first_child(bus, &dev);
	     dev;
	     device_find_next_child(&dev)) {
		pplat = dev_get_parent_platdata(dev);
		if (pplat->vendor == vendor && pplat->device == device) {
			if (!(*indexp)--) {
				*devp = dev;
				return 0;
			}
		}
	}