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/*

 * QEMU PCI bus manager

 *

 * Copyright (c) 2004 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to dea

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

/*

 * split out from pci.c

 * Copyright (c) 2010 Isaku Yamahata <yamahata at valinux co jp>

 *                    VA Linux Systems Japan K.K.

 */

#include "hw/pci/pci_bridge.h"

#include "hw/pci/pci_bus.h"

#include "qemu/range.h"

/* PCI bridge subsystem vendor ID helper functions */

#define PCI_SSVID_SIZEOF        8

#define PCI_SSVID_SVID          4

#define PCI_SSVID_SSID          6

int pci_bridge_ssvid_init(PCIDevice *dev, uint8_t offset,

                          uint16_t svid, uint16_t ssid)

{

    int pos;

    pos = pci_add_capability(dev, PCI_CAP_ID_SSVID, offset, PCI_SSVID_SIZEOF);

    if (pos < 0) {

        return pos;

    }

    pci_set_word(dev->config + pos + PCI_SSVID_SVID, svid);

    pci_set_word(dev->config + pos + PCI_SSVID_SSID, ssid);

    return pos;

}

/* Accessor function to get parent bridge device from pci bus. */

PCIDevice *pci_bridge_get_device(PCIBus *bus)

{

    return bus->parent_dev;

}

/* Accessor function to get secondary bus from pci-to-pci bridge device */

PCIBus *pci_bridge_get_sec_bus(PCIBridge *br)

{

    return &br->sec_bus;

}

static uint32_t pci_config_get_io_base(const PCIDevice *d,

                                       uint32_t base, uint32_t base_upper16)

{

    uint32_t val;

    val = ((uint32_t)d->config[base] & PCI_IO_RANGE_MASK) << 8;

    if (d->config[base] & PCI_IO_RANGE_TYPE_32) {

        val |= (uint32_t)pci_get_word(d->config + base_upper16) << 16;

    }

    return val;

}

static pcibus_t pci_config_get_memory_base(const PCIDevice *d, uint32_t base)

{

    return ((pcibus_t)pci_get_word(d->config + base) & PCI_MEMORY_RANGE_MASK)

        << 16;

}

static pcibus_t pci_config_get_pref_base(const PCIDevice *d,

                                         uint32_t base, uint32_t upper)

{

    pcibus_t tmp;

    pcibus_t val;

    tmp = (pcibus_t)pci_get_word(d->config + base);

    val = (tmp & PCI_PREF_RANGE_MASK) << 16;

    if (tmp & PCI_PREF_RANGE_TYPE_64) {

        val |= (pcibus_t)pci_get_long(d->config + upper) << 32;

    }

    return val;

}

/* accessor function to get bridge filtering base address */

pcibus_t pci_bridge_get_base(const PCIDevice *bridge, uint8_t type)

{

    pcibus_t base;

    if (type & PCI_BASE_ADDRESS_SPACE_IO) {

        base = pci_config_get_io_base(bridge,

                                      PCI_IO_BASE, PCI_IO_BASE_UPPER16);

    } else {

        if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {

            base = pci_config_get_pref_base(

                bridge, PCI_PREF_MEMORY_BASE, PCI_PREF_BASE_UPPER32);

        } else {

            base = pci_config_get_memory_base(bridge, PCI_MEMORY_BASE);

        }

    }

    return base;

}

/* accessor funciton to get bridge filtering limit */

pcibus_t pci_bridge_get_limit(const PCIDevice *bridge, uint8_t type)

{

    pcibus_t limit;

    if (type & PCI_BASE_ADDRESS_SPACE_IO) {

        limit = pci_config_get_io_base(bridge,

                                      PCI_IO_LIMIT, PCI_IO_LIMIT_UPPER16);

        limit |= 0xfff;         /* PCI bridge spec 3.2.5.6. */

    } else {

        if (type & PCI_BASE_ADDRESS_MEM_PREFETCH) {

            limit = pci_config_get_pref_base(

                bridge, PCI_PREF_MEMORY_LIMIT, PCI_PREF_LIMIT_UPPER32);

        } else {

            limit = pci_config_get_memory_base(bridge, PCI_MEMORY_LIMIT);

        }

        limit |= 0xfffff;       /* PCI bridge spec 3.2.5.{1, 8}. */

    }

    return limit;

}

static void pci_bridge_init_alias(PCIBridge *bridge, MemoryRegion *alias,

                                  uint8_t type, const char *name,

                                  MemoryRegion *space,

                                  MemoryRegion *parent_space,

                                  bool enabled)

{

    pcibus_t base = pci_bridge_get_base(&bridge->dev, type);

    pcibus_t limit = pci_bridge_get_limit(&bridge->dev, type);

    /* TODO: this doesn't handle base = 0 limit = 2^64 - 1 correctly.

     * Apparently no way to do this with existing memory APIs. */

    pcibus_t size = enabled && limit >= base ? limit + 1 - base : 0;

    memory_region_init_alias(alias, name, space, base, size);

    memory_region_add_subregion_overlap(parent_space, base, alias, 1);

}

static PCIBridgeWindows *pci_bridge_region_init(PCIBridge *br)

{

    PCIBus *parent = br->dev.bus;

    PCIBridgeWindows *w = g_new(PCIBridgeWindows, 1);

    uint16_t cmd = pci_get_word(br->dev.config + PCI_COMMAND);

    pci_bridge_init_alias(br, &w->alias_pref_mem,

                          PCI_BASE_ADDRESS_MEM_PREFETCH,

                          "pci_bridge_pref_mem",

                          &br->address_space_mem,

                          parent->address_space_mem,

                          cmd & PCI_COMMAND_MEMORY);

    pci_bridge_init_alias(br, &w->alias_mem,

                          PCI_BASE_ADDRESS_SPACE_MEMORY,

                          "pci_bridge_mem",

                          &br->address_space_mem,

                          parent->address_space_mem,

                          cmd & PCI_COMMAND_MEMORY);

    pci_bridge_init_alias(br, &w->alias_io,

                          PCI_BASE_ADDRESS_SPACE_IO,

                          "pci_bridge_io",

                          &br->address_space_io,

                          parent->address_space_io,

                          cmd & PCI_COMMAND_IO);

   /* TODO: optinal VGA and VGA palette snooping support. */

    return w;

}

static void pci_bridge_region_del(PCIBridge *br, PCIBridgeWindows *w)

{

    PCIBus *parent = br->dev.bus;

    memory_region_del_subregion(parent->address_space_io, &w->alias_io);

    memory_region_del_subregion(parent->address_space_mem, &w->alias_mem);

    memory_region_del_subregion(parent->address_space_mem, &w->alias_pref_mem);

}

static void pci_bridge_region_cleanup(PCIBridge *br, PCIBridgeWindows *w)

{

    memory_region_destroy(&w->alias_io);

    memory_region_destroy(&w->alias_mem);

    memory_region_destroy(&w->alias_pref_mem);

    g_free(w);

}

static void pci_bridge_update_mappings(PCIBridge *br)

{

    PCIBridgeWindows *w = br->windows;

    /* Make updates atomic to: handle the case of one VCPU updating the bridge

     * while another accesses an unaffected region. */

    memory_region_transaction_begin();

    pci_bridge_region_del(br, br->windows);

    br->windows = pci_bridge_region_init(br);

    memory_region_transaction_commit();

    pci_bridge_region_cleanup(br, w);

}

/* default write_config function for PCI-to-PCI bridge */

void pci_bridge_write_config(PCIDevice *d,

                             uint32_t address, uint32_t val, int len)

{

    PCIBridge *s = container_of(d, PCIBridge, dev);

    uint16_t oldctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);

    uint16_t newctl;

    pci_default_write_config(d, address, val, len);

    if (ranges_overlap(address, len, PCI_COMMAND, 2) ||

        /* io base/limit */

        ranges_overlap(address, len, PCI_IO_BASE, 2) ||

        /* memory base/limit, prefetchable base/limit and

           io base/limit upper 16 */

        ranges_overlap(address, len, PCI_MEMORY_BASE, 20)) {

        pci_bridge_update_mappings(s);

    }

    newctl = pci_get_word(d->config + PCI_BRIDGE_CONTROL);

    if (~oldctl & newctl & PCI_BRIDGE_CTL_BUS_RESET) {

        /* Trigger hot reset on 0->1 transition. */

        pci_bus_reset(&s->sec_bus);

    }

}

void pci_bridge_disable_base_limit(PCIDevice *dev)

{

    uint8_t *conf = dev->config;

    pci_byte_test_and_set_mask(conf + PCI_IO_BASE,

                               PCI_IO_RANGE_MASK & 0xff);

    pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,

                                 PCI_IO_RANGE_MASK & 0xff);

    pci_word_test_and_set_mask(conf + PCI_MEMORY_BASE,

                               PCI_MEMORY_RANGE_MASK & 0xffff);

    pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,

                                 PCI_MEMORY_RANGE_MASK & 0xffff);

    pci_word_test_and_set_mask(conf + PCI_PREF_MEMORY_BASE,

                               PCI_PREF_RANGE_MASK & 0xffff);

    pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,

                                 PCI_PREF_RANGE_MASK & 0xffff);

    pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0);

    pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0);

}

/* reset bridge specific configuration registers */

void pci_bridge_reset(DeviceState *qdev)

{

    PCIDevice *dev = PCI_DEVICE(qdev);

    uint8_t *conf = dev->config;

    conf[PCI_PRIMARY_BUS] = 0;

    conf[PCI_SECONDARY_BUS] = 0;

    conf[PCI_SUBORDINATE_BUS] = 0;

    conf[PCI_SEC_LATENCY_TIMER] = 0;

    /*

     * the default values for base/limit registers aren't specified

     * in the PCI-to-PCI-bridge spec. So we don't thouch them here.

     * Each implementation can override it.

     * typical implementation does

     * zero base/limit registers or

     * disable forwarding: pci_bridge_disable_base_limit()

     * If disable forwarding is wanted, call pci_bridge_disable_base_limit()

     * after this function.

     */

    pci_byte_test_and_clear_mask(conf + PCI_IO_BASE,

                                 PCI_IO_RANGE_MASK & 0xff);

    pci_byte_test_and_clear_mask(conf + PCI_IO_LIMIT,

                                 PCI_IO_RANGE_MASK & 0xff);

    pci_word_test_and_clear_mask(conf + PCI_MEMORY_BASE,

                                 PCI_MEMORY_RANGE_MASK & 0xffff);

    pci_word_test_and_clear_mask(conf + PCI_MEMORY_LIMIT,

                                 PCI_MEMORY_RANGE_MASK & 0xffff);

    pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_BASE,

                                 PCI_PREF_RANGE_MASK & 0xffff);

    pci_word_test_and_clear_mask(conf + PCI_PREF_MEMORY_LIMIT,

                                 PCI_PREF_RANGE_MASK & 0xffff);

    pci_set_long(conf + PCI_PREF_BASE_UPPER32, 0);

    pci_set_long(conf + PCI_PREF_LIMIT_UPPER32, 0);

    pci_set_word(conf + PCI_BRIDGE_CONTROL, 0);

}

/* default qdev initialization function for PCI-to-PCI bridge */

int pci_bridge_initfn(PCIDevice *dev)

{

    PCIBus *parent = dev->bus;

    PCIBridge *br = DO_UPCAST(PCIBridge, dev, dev);

    PCIBus *sec_bus = &br->sec_bus;

    pci_word_test_and_set_mask(dev->config + PCI_STATUS,

                               PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);

    pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_PCI);

    dev->config[PCI_HEADER_TYPE] =

        (dev->config[PCI_HEADER_TYPE] & PCI_HEADER_TYPE_MULTI_FUNCTION) |

        PCI_HEADER_TYPE_BRIDGE;

    pci_set_word(dev->config + PCI_SEC_STATUS,

                 PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);

    /*

     * If we don't specify the name, the bus will be addressed as <id>.0, where

     * id is the device id.

     * Since PCI Bridge devices have a single bus each, we don't need the index:

     * let users address the bus using the device name.

     */

    if (!br->bus_name && dev->qdev.id && *dev->qdev.id) {

            br->bus_name = dev->qdev.id;

    }

    qbus_create_inplace(&sec_bus->qbus, TYPE_PCI_BUS, &dev->qdev,

                        br->bus_name);

    sec_bus->parent_dev = dev;

    sec_bus->map_irq = br->map_irq;

    sec_bus->address_space_mem = &br->address_space_mem;

    memory_region_init(&br->address_space_mem, "pci_bridge_pci", INT64_MAX);

    sec_bus->address_space_io = &br->address_space_io;

    memory_region_init(&br->address_space_io, "pci_bridge_io", 65536);

    br->windows = pci_bridge_region_init(br);

    QLIST_INIT(&sec_bus->child);

    QLIST_INSERT_HEAD(&parent->child, sec_bus, sibling);

    return 0;

}

/* default qdev clean up function for PCI-to-PCI bridge */

void pci_bridge_exitfn(PCIDevice *pci_dev)

{

    PCIBridge *s = DO_UPCAST(PCIBridge, dev, pci_dev);

    assert(QLIST_EMPTY(&s->sec_bus.child));

    QLIST_REMOVE(&s->sec_bus, sibling);

    pci_bridge_region_del(s, s->windows);

    pci_bridge_region_cleanup(s, s->windows);

    memory_region_destroy(&s->address_space_mem);

    memory_region_destroy(&s->address_space_io);

    /* qbus_free() is called automatically by qdev_free() */

}

/*

 * before qdev initialization(qdev_init()), this function sets bus_name and

 * map_irq callback which are necessry for pci_bridge_initfn() to

 * initialize bus.

 */

void pci_bridge_map_irq(PCIBridge *br, const char* bus_name,

                        pci_map_irq_fn map_irq)

{

    br->map_irq = map_irq;

    br->bus_name = bus_name;

}