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/*

 *      drivers/pci/setup-res.c

 *

 * Extruded from code written by

 *      Dave Rusling (david.rusling@reo.mts.dec.com)

 *      David Mosberger (davidm@cs.arizona.edu)

 *      David Miller (davem@redhat.com)

 *

 * Support routines for initializing a PCI subsystem.

 */

/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */

/*

 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>

 *           Resource sorting

 */

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/pci.h>

#include <linux/errno.h>

#include <linux/ioport.h>

#include <linux/cache.h>

#include <linux/slab.h>

#include "pci.h"

void

pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)

{

        struct pci_bus_region region;

        u32 new, check, mask;

        int reg;

        /*

         * Ignore resources for unimplemented BARs and unused resource slots

         * for 64 bit BARs.

         */

        if (!res->flags)

                return;

        /*

         * Ignore non-moveable resources.  This might be legacy resources for

         * which no functional BAR register exists or another important

         * system resource we should better not move around in system address

         * space.

         */

        if (res->flags & IORESOURCE_PCI_FIXED)

                return;

        pcibios_resource_to_bus(dev, &region, res);

        pr_debug("  got res [%llx:%llx] bus [%lx:%lx] flags %lx for "

                 "BAR %d of %s\n", (unsigned long long)res->start,

                 (unsigned long long)res->end,

                 region.start, region.end, res->flags, resno, pci_name(dev));

        new = region.start | (res->flags & PCI_REGION_FLAG_MASK);

        if (res->flags & IORESOURCE_IO)

                mask = (u32)PCI_BASE_ADDRESS_IO_MASK;

        else

                mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;

        if (resno < 6) {

                reg = PCI_BASE_ADDRESS_0 + 4 * resno;

        } else if (resno == PCI_ROM_RESOURCE) {

                if (!(res->flags & IORESOURCE_ROM_ENABLE))

                        return;

                new |= PCI_ROM_ADDRESS_ENABLE;

                reg = dev->rom_base_reg;

        } else {

                /* Hmm, non-standard resource. */

                return;         /* kill uninitialised var warning */

        }

        pci_write_config_dword(dev, reg, new);

        pci_read_config_dword(dev, reg, &check);

        if ((new ^ check) & mask) {

                printk(KERN_ERR "PCI: Error while updating region "

                       "%s/%d (%08x != %08x)\n", pci_name(dev), resno,

                       new, check);

        }

        if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==

            (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {

                new = region.start >> 16 >> 16;

                pci_write_config_dword(dev, reg + 4, new);

                pci_read_config_dword(dev, reg + 4, &check);

                if (check != new) {

                        printk(KERN_ERR "PCI: Error updating region "

                               "%s/%d (high %08x != %08x)\n",

                               pci_name(dev), resno, new, check);

                }

        }

        res->flags &= ~IORESOURCE_UNSET;

        pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",

                pci_name(dev), resno, res->flags,

                new & ~PCI_REGION_FLAG_MASK);

}

int pci_claim_resource(struct pci_dev *dev, int resource)

{

        struct resource *res = &dev->resource[resource];

        struct resource *root = NULL;

        char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";

        int err;

        root = pcibios_select_root(dev, res);

        err = -EINVAL;

        if (root != NULL)

                err = insert_resource(root, res);

        if (err) {

                printk(KERN_ERR "PCI: %s region %d of %s %s [%llx:%llx]\n",

                        root ? "Address space collision on" :

                                "No parent found for",

                        resource, dtype, pci_name(dev),

                        (unsigned long long)res->start,

                        (unsigned long long)res->end);

        }

        return err;

}

EXPORT_SYMBOL_GPL(pci_claim_resource);

int pci_assign_resource(struct pci_dev *dev, int resno)

{

        struct pci_bus *bus = dev->bus;

        struct resource *res = dev->resource + resno;

        resource_size_t size, min, align;

        int ret;

        size = res->end - res->start + 1;

        min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;

        /* The bridge resources are special, as their

           size != alignment. Sizing routines return

           required alignment in the "start" field. */

        align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;

        /* First, try exact prefetching match.. */

        ret = pci_bus_alloc_resource(bus, res, size, align, min,

                                     IORESOURCE_PREFETCH,

                                     pcibios_align_resource, dev);

        if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {

                /*

                 * That failed.

                 *

                 * But a prefetching area can handle a non-prefetching

                 * window (it will just not perform as well).

                 */

                ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,

                                             pcibios_align_resource, dev);

        }

        if (ret) {

                printk(KERN_ERR "PCI: Failed to allocate %s resource "

                        "#%d:%llx@%llx for %s\n",

                        res->flags & IORESOURCE_IO ? "I/O" : "mem",

                        resno, (unsigned long long)size,

                        (unsigned long long)res->start, pci_name(dev));

        } else if (resno < PCI_BRIDGE_RESOURCES) {

                pci_update_resource(dev, res, resno);

        }

        return ret;

}

#ifdef CONFIG_EMBEDDED

int pci_assign_resource_fixed(struct pci_dev *dev, int resno)

{

        struct pci_bus *bus = dev->bus;

        struct resource *res = dev->resource + resno;

        unsigned int type_mask;

        int i, ret = -EBUSY;

        type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;

        for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {

                struct resource *r = bus->resource[i];

                if (!r)

                        continue;

                /* type_mask must match */

                if ((res->flags ^ r->flags) & type_mask)

                        continue;

                ret = request_resource(r, res);

                if (ret == 0)

                        break;

        }

        if (ret) {

                printk(KERN_ERR "PCI: Failed to allocate %s resource "

                                "#%d:%llx@%llx for %s\n",

                        res->flags & IORESOURCE_IO ? "I/O" : "mem",

                        resno, (unsigned long long)(res->end - res->start + 1),

                        (unsigned long long)res->start, pci_name(dev));

        } else if (resno < PCI_BRIDGE_RESOURCES) {

                pci_update_resource(dev, res, resno);

        }

        return ret;

}

EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);

#endif

/* Sort resources by alignment */

void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)

{

        int i;

        for (i = 0; i < PCI_NUM_RESOURCES; i++) {

                struct resource *r;

                struct resource_list *list, *tmp;

                resource_size_t r_align;

                r = &dev->resource[i];

                if (r->flags & IORESOURCE_PCI_FIXED)

                        continue;

                r_align = r->end - r->start;

                if (!(r->flags) || r->parent)

                        continue;

                if (!r_align) {

                        printk(KERN_WARNING "PCI: Ignore bogus resource %d "

                                "[%llx:%llx] of %s\n",

                                i, (unsigned long long)r->start,

                                (unsigned long long)r->end, pci_name(dev));

                        continue;

                }

                r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;

                for (list = head; ; list = list->next) {

                        resource_size_t align = 0;

                        struct resource_list *ln = list->next;

                        int idx;

                        if (ln) {

                                idx = ln->res - &ln->dev->resource[0];

                                align = (idx < PCI_BRIDGE_RESOURCES) ?

                                        ln->res->end - ln->res->start + 1 :

                                        ln->res->start;

                        }

                        if (r_align > align) {

                                tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);

                                if (!tmp)

                                        panic("pdev_sort_resources(): "

                                              "kmalloc() failed!\n");

                                tmp->next = ln;

                                tmp->res = r;

                                tmp->dev = dev;

                                list->next = tmp;

                                break;

                        }

                }

        }

}