gwj / at91sam9263 · Files

/*
 * 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 deal
 * 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.
 */

#include "hw.h"
#include "pci.h"
#include "console.h"
#include "net.h"

#include "virtio-net.h"

//#define DEBUG_PCI

struct PCIBus {
    int bus_num;
    int devfn_min;

    pci_set_irq_fn set_irq;

    pci_map_irq_fn map_irq;

    uint32_t config_reg; /* XXX: suppress */

    /* low level pic */
    SetIRQFunc *low_set_irq;

    qemu_irq *irq_opaque;

    PCIDevice *devices[256];

    PCIDevice *parent_dev;
    PCIBus *next;

    /* The bus IRQ state is the logical OR of the connected devices.
       Keep a count of the number of devices with raised IRQs.  */

    int nirq;

    int irq_count[];

};

static void pci_update_mappings(PCIDevice *d);

static void pci_set_irq(void *opaque, int irq_num, int level);

target_phys_addr_t pci_mem_base;

static uint16_t pci_default_sub_vendor_id = PCI_SUBVENDOR_ID_REDHAT_QUMRANET;
static uint16_t pci_default_sub_device_id = PCI_SUBDEVICE_ID_QEMU;

static int pci_irq_index;

static PCIBus *first_bus;

static void pcibus_save(QEMUFile *f, void *opaque)
{
    PCIBus *bus = (PCIBus *)opaque;
    int i;

    qemu_put_be32(f, bus->nirq);
    for (i = 0; i < bus->nirq; i++)
        qemu_put_be32(f, bus->irq_count[i]);
}

static int  pcibus_load(QEMUFile *f, void *opaque, int version_id)
{
    PCIBus *bus = (PCIBus *)opaque;
    int i, nirq;

    if (version_id != 1)
        return -EINVAL;

    nirq = qemu_get_be32(f);
    if (bus->nirq != nirq) {
        fprintf(stderr, "pcibus_load: nirq mismatch: src=%d dst=%d\n",
                nirq, bus->nirq);
        return -EINVAL;
    }

    for (i = 0; i < nirq; i++)
        bus->irq_count[i] = qemu_get_be32(f);

    return 0;
}

PCIBus *pci_register_bus(pci_set_irq_fn set_irq, pci_map_irq_fn map_irq,

                         qemu_irq *pic, int devfn_min, int nirq)

{
    PCIBus *bus;

    static int nbus = 0;

    bus = qemu_mallocz(sizeof(PCIBus) + (nirq * sizeof(int)));

    bus->set_irq = set_irq;

    bus->map_irq = map_irq;

    bus->irq_opaque = pic;
    bus->devfn_min = devfn_min;

    bus->nirq = nirq;

    first_bus = bus;

    register_savevm("PCIBUS", nbus++, 1, pcibus_save, pcibus_load, bus);

    return bus;
}

static PCIBus *pci_register_secondary_bus(PCIDevice *dev, pci_map_irq_fn map_irq)

{
    PCIBus *bus;
    bus = qemu_mallocz(sizeof(PCIBus));
    bus->map_irq = map_irq;
    bus->parent_dev = dev;
    bus->next = dev->bus->next;
    dev->bus->next = bus;
    return bus;
}

int pci_bus_num(PCIBus *s)
{
    return s->bus_num;
}

void pci_device_save(PCIDevice *s, QEMUFile *f)

{

    int i;

    qemu_put_be32(f, 2); /* PCI device version */

    qemu_put_buffer(f, s->config, 256);

    for (i = 0; i < 4; i++)
        qemu_put_be32(f, s->irq_state[i]);

}

int pci_device_load(PCIDevice *s, QEMUFile *f)

{

    uint32_t version_id;

    int i;

    version_id = qemu_get_be32(f);

    if (version_id > 2)

        return -EINVAL;
    qemu_get_buffer(f, s->config, 256);

    pci_update_mappings(s);

    if (version_id >= 2)
        for (i = 0; i < 4; i ++)
            s->irq_state[i] = qemu_get_be32(f);

    return 0;
}

static int pci_set_default_subsystem_id(PCIDevice *pci_dev)
{
    uint16_t *id;

    id = (void*)(&pci_dev->config[PCI_SUBVENDOR_ID]);
    id[0] = cpu_to_le16(pci_default_sub_vendor_id);
    id[1] = cpu_to_le16(pci_default_sub_device_id);
    return 0;
}

/* -1 for devfn means auto assign */

PCIDevice *pci_register_device(PCIBus *bus, const char *name,

                               int instance_size, int devfn,

                               PCIConfigReadFunc *config_read,

                               PCIConfigWriteFunc *config_write)
{

    PCIDevice *pci_dev;

    if (pci_irq_index >= PCI_DEVICES_MAX)
        return NULL;

    if (devfn < 0) {

        for(devfn = bus->devfn_min ; devfn < 256; devfn += 8) {
            if (!bus->devices[devfn])

                goto found;
        }
        return NULL;
    found: ;
    }
    pci_dev = qemu_mallocz(instance_size);
    if (!pci_dev)
        return NULL;

    pci_dev->bus = bus;

    pci_dev->devfn = devfn;
    pstrcpy(pci_dev->name, sizeof(pci_dev->name), name);

    memset(pci_dev->irq_state, 0, sizeof(pci_dev->irq_state));

    pci_set_default_subsystem_id(pci_dev);

    if (!config_read)
        config_read = pci_default_read_config;
    if (!config_write)
        config_write = pci_default_write_config;

    pci_dev->config_read = config_read;
    pci_dev->config_write = config_write;

    pci_dev->irq_index = pci_irq_index++;

    bus->devices[devfn] = pci_dev;

    pci_dev->irq = qemu_allocate_irqs(pci_set_irq, pci_dev, 4);

    return pci_dev;
}

void pci_register_io_region(PCIDevice *pci_dev, int region_num,
                            uint32_t size, int type,

                            PCIMapIORegionFunc *map_func)
{
    PCIIORegion *r;

    uint32_t addr;

    if ((unsigned int)region_num >= PCI_NUM_REGIONS)

        return;
    r = &pci_dev->io_regions[region_num];
    r->addr = -1;
    r->size = size;
    r->type = type;
    r->map_func = map_func;

    if (region_num == PCI_ROM_SLOT) {
        addr = 0x30;
    } else {
        addr = 0x10 + region_num * 4;
    }
    *(uint32_t *)(pci_dev->config + addr) = cpu_to_le32(type);

}

static target_phys_addr_t pci_to_cpu_addr(target_phys_addr_t addr)

{

    return addr + pci_mem_base;

}

static void pci_update_mappings(PCIDevice *d)
{
    PCIIORegion *r;
    int cmd, i;

    uint32_t last_addr, new_addr, config_ofs;

    cmd = le16_to_cpu(*(uint16_t *)(d->config + PCI_COMMAND));

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

        r = &d->io_regions[i];

        if (i == PCI_ROM_SLOT) {
            config_ofs = 0x30;
        } else {
            config_ofs = 0x10 + i * 4;
        }

        if (r->size != 0) {
            if (r->type & PCI_ADDRESS_SPACE_IO) {
                if (cmd & PCI_COMMAND_IO) {

                    new_addr = le32_to_cpu(*(uint32_t *)(d->config +

                                                         config_ofs));

                    new_addr = new_addr & ~(r->size - 1);
                    last_addr = new_addr + r->size - 1;
                    /* NOTE: we have only 64K ioports on PC */
                    if (last_addr <= new_addr || new_addr == 0 ||
                        last_addr >= 0x10000) {
                        new_addr = -1;
                    }
                } else {
                    new_addr = -1;
                }
            } else {
                if (cmd & PCI_COMMAND_MEMORY) {

                    new_addr = le32_to_cpu(*(uint32_t *)(d->config +

                                                         config_ofs));
                    /* the ROM slot has a specific enable bit */
                    if (i == PCI_ROM_SLOT && !(new_addr & 1))
                        goto no_mem_map;

                    new_addr = new_addr & ~(r->size - 1);
                    last_addr = new_addr + r->size - 1;
                    /* NOTE: we do not support wrapping */
                    /* XXX: as we cannot support really dynamic
                       mappings, we handle specific values as invalid
                       mappings. */
                    if (last_addr <= new_addr || new_addr == 0 ||
                        last_addr == -1) {
                        new_addr = -1;
                    }
                } else {

                no_mem_map:

                    new_addr = -1;
                }
            }
            /* now do the real mapping */
            if (new_addr != r->addr) {
                if (r->addr != -1) {
                    if (r->type & PCI_ADDRESS_SPACE_IO) {
                        int class;
                        /* NOTE: specific hack for IDE in PC case:
                           only one byte must be mapped. */
                        class = d->config[0x0a] | (d->config[0x0b] << 8);
                        if (class == 0x0101 && r->size == 4) {
                            isa_unassign_ioport(r->addr + 2, 1);
                        } else {
                            isa_unassign_ioport(r->addr, r->size);
                        }
                    } else {

                        cpu_register_physical_memory(pci_to_cpu_addr(r->addr),

                                                     r->size,

                                                     IO_MEM_UNASSIGNED);

                        qemu_unregister_coalesced_mmio(r->addr, r->size);

                    }
                }
                r->addr = new_addr;
                if (r->addr != -1) {
                    r->map_func(d, i, r->addr, r->size, r->type);
                }
            }
        }
    }
}

uint32_t pci_default_read_config(PCIDevice *d,

                                 uint32_t address, int len)

{

    uint32_t val;

    switch(len) {
    default:
    case 4:

	if (address <= 0xfc) {
	    val = le32_to_cpu(*(uint32_t *)(d->config + address));
	    break;
	}
	/* fall through */
    case 2:
        if (address <= 0xfe) {
	    val = le16_to_cpu(*(uint16_t *)(d->config + address));
	    break;
	}
	/* fall through */
    case 1:
        val = d->config[address];

        break;
    }
    return val;
}

void pci_default_write_config(PCIDevice *d,

                              uint32_t address, uint32_t val, int len)
{
    int can_write, i;

    uint32_t end, addr;

    if (len == 4 && ((address >= 0x10 && address < 0x10 + 4 * 6) ||

                     (address >= 0x30 && address < 0x34))) {

        PCIIORegion *r;
        int reg;

        if ( address >= 0x30 ) {
            reg = PCI_ROM_SLOT;
        }else{
            reg = (address - 0x10) >> 2;
        }

        r = &d->io_regions[reg];
        if (r->size == 0)
            goto default_config;
        /* compute the stored value */

        if (reg == PCI_ROM_SLOT) {
            /* keep ROM enable bit */
            val &= (~(r->size - 1)) | 1;
        } else {
            val &= ~(r->size - 1);
            val |= r->type;
        }
        *(uint32_t *)(d->config + address) = cpu_to_le32(val);

        pci_update_mappings(d);

        return;

    }
 default_config:
    /* not efficient, but simple */

    addr = address;

    for(i = 0; i < len; i++) {
        /* default read/write accesses */

        switch(d->config[0x0e]) {

        case 0x00:

        case 0x80:
            switch(addr) {
            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x08:
            case 0x09:
            case 0x0a:
            case 0x0b:
            case 0x0e:
            case 0x10 ... 0x27: /* base */

            case 0x2c ... 0x2f: /* read-only subsystem ID & vendor ID */

            case 0x30 ... 0x33: /* rom */
            case 0x3d:
                can_write = 0;
                break;
            default:
                can_write = 1;
                break;
            }

            break;
        default:

        case 0x01:
            switch(addr) {
            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x08:
            case 0x09:
            case 0x0a:
            case 0x0b:
            case 0x0e:

            case 0x2c ... 0x2f: /* read-only subsystem ID & vendor ID */

            case 0x38 ... 0x3b: /* rom */
            case 0x3d:
                can_write = 0;
                break;
            default:
                can_write = 1;
                break;
            }

            break;
        }
        if (can_write) {

            /* Mask out writes to reserved bits in registers */
            switch (addr) {

	    case 0x05:
                val &= ~PCI_COMMAND_RESERVED_MASK_HI;
                break;

            case 0x06:
                val &= ~PCI_STATUS_RESERVED_MASK_LO;
                break;
            case 0x07:
                val &= ~PCI_STATUS_RESERVED_MASK_HI;
                break;
            }

            d->config[addr] = val;

        }

        if (++addr > 0xff)
        	break;

        val >>= 8;
    }

    end = address + len;
    if (end > PCI_COMMAND && address < (PCI_COMMAND + 2)) {
        /* if the command register is modified, we must modify the mappings */
        pci_update_mappings(d);

    }
}

void pci_data_write(void *opaque, uint32_t addr, uint32_t val, int len)

{

    PCIBus *s = opaque;
    PCIDevice *pci_dev;
    int config_addr, bus_num;

#if defined(DEBUG_PCI) && 0
    printf("pci_data_write: addr=%08x val=%08x len=%d\n",

           addr, val, len);

#endif

    bus_num = (addr >> 16) & 0xff;

    while (s && s->bus_num != bus_num)
        s = s->next;
    if (!s)

        return;

    pci_dev = s->devices[(addr >> 8) & 0xff];

    if (!pci_dev)
        return;

    config_addr = addr & 0xff;

#if defined(DEBUG_PCI)
    printf("pci_config_write: %s: addr=%02x val=%08x len=%d\n",
           pci_dev->name, config_addr, val, len);
#endif

    pci_dev->config_write(pci_dev, config_addr, val, len);

}

uint32_t pci_data_read(void *opaque, uint32_t addr, int len)

{

    PCIBus *s = opaque;
    PCIDevice *pci_dev;
    int config_addr, bus_num;

    uint32_t val;

    bus_num = (addr >> 16) & 0xff;

    while (s && s->bus_num != bus_num)
        s= s->next;
    if (!s)

        goto fail;

    pci_dev = s->devices[(addr >> 8) & 0xff];

    if (!pci_dev) {
    fail:

        switch(len) {
        case 1:
            val = 0xff;
            break;
        case 2:
            val = 0xffff;
            break;
        default:
        case 4:
            val = 0xffffffff;
            break;
        }

        goto the_end;
    }

    config_addr = addr & 0xff;

    val = pci_dev->config_read(pci_dev, config_addr, len);
#if defined(DEBUG_PCI)
    printf("pci_config_read: %s: addr=%02x val=%08x len=%d\n",
           pci_dev->name, config_addr, val, len);
#endif
 the_end:
#if defined(DEBUG_PCI) && 0
    printf("pci_data_read: addr=%08x val=%08x len=%d\n",

           addr, val, len);

#endif
    return val;
}

/***********************************************************/
/* generic PCI irq support */

/* 0 <= irq_num <= 3. level must be 0 or 1 */

static void pci_set_irq(void *opaque, int irq_num, int level)

{

    PCIDevice *pci_dev = (PCIDevice *)opaque;

    PCIBus *bus;
    int change;

    change = level - pci_dev->irq_state[irq_num];
    if (!change)
        return;

    pci_dev->irq_state[irq_num] = level;

    for (;;) {
        bus = pci_dev->bus;

        irq_num = bus->map_irq(pci_dev, irq_num);

        if (bus->set_irq)
            break;

        pci_dev = bus->parent_dev;
    }
    bus->irq_count[irq_num] += change;

    bus->set_irq(bus->irq_opaque, irq_num, bus->irq_count[irq_num] != 0);

}

/***********************************************************/
/* monitor info on PCI */

typedef struct {
    uint16_t class;
    const char *desc;
} pci_class_desc;

static const pci_class_desc pci_class_descriptions[] =

{

    { 0x0100, "SCSI controller"},

    { 0x0101, "IDE controller"},

    { 0x0102, "Floppy controller"},
    { 0x0103, "IPI controller"},
    { 0x0104, "RAID controller"},
    { 0x0106, "SATA controller"},
    { 0x0107, "SAS controller"},
    { 0x0180, "Storage controller"},

    { 0x0200, "Ethernet controller"},

    { 0x0201, "Token Ring controller"},
    { 0x0202, "FDDI controller"},
    { 0x0203, "ATM controller"},
    { 0x0280, "Network controller"},

    { 0x0300, "VGA controller"},

    { 0x0301, "XGA controller"},
    { 0x0302, "3D controller"},
    { 0x0380, "Display controller"},
    { 0x0400, "Video controller"},
    { 0x0401, "Audio controller"},
    { 0x0402, "Phone"},
    { 0x0480, "Multimedia controller"},
    { 0x0500, "RAM controller"},
    { 0x0501, "Flash controller"},
    { 0x0580, "Memory controller"},

    { 0x0600, "Host bridge"},
    { 0x0601, "ISA bridge"},

    { 0x0602, "EISA bridge"},
    { 0x0603, "MC bridge"},

    { 0x0604, "PCI bridge"},

    { 0x0605, "PCMCIA bridge"},
    { 0x0606, "NUBUS bridge"},
    { 0x0607, "CARDBUS bridge"},
    { 0x0608, "RACEWAY bridge"},
    { 0x0680, "Bridge"},

    { 0x0c03, "USB controller"},
    { 0, NULL}
};

static void pci_info_device(PCIDevice *d)

{

    int i, class;
    PCIIORegion *r;

    const pci_class_desc *desc;

    term_printf("  Bus %2d, device %3d, function %d:\n",
           d->bus->bus_num, d->devfn >> 3, d->devfn & 7);
    class = le16_to_cpu(*((uint16_t *)(d->config + PCI_CLASS_DEVICE)));
    term_printf("    ");

    desc = pci_class_descriptions;
    while (desc->desc && class != desc->class)
        desc++;
    if (desc->desc) {
        term_printf("%s", desc->desc);
    } else {

        term_printf("Class %04x", class);

    }

    term_printf(": PCI device %04x:%04x\n",
           le16_to_cpu(*((uint16_t *)(d->config + PCI_VENDOR_ID))),
           le16_to_cpu(*((uint16_t *)(d->config + PCI_DEVICE_ID))));

    if (d->config[PCI_INTERRUPT_PIN] != 0) {
        term_printf("      IRQ %d.\n", d->config[PCI_INTERRUPT_LINE]);

    }

    if (class == 0x0604) {
        term_printf("      BUS %d.\n", d->config[0x19]);
    }

    for(i = 0;i < PCI_NUM_REGIONS; i++) {
        r = &d->io_regions[i];
        if (r->size != 0) {
            term_printf("      BAR%d: ", i);
            if (r->type & PCI_ADDRESS_SPACE_IO) {

                term_printf("I/O at 0x%04x [0x%04x].\n",

                       r->addr, r->addr + r->size - 1);
            } else {

                term_printf("32 bit memory at 0x%08x [0x%08x].\n",

                       r->addr, r->addr + r->size - 1);
            }
        }

    }

    if (class == 0x0604 && d->config[0x19] != 0) {
        pci_for_each_device(d->config[0x19], pci_info_device);
    }

}

void pci_for_each_device(int bus_num, void (*fn)(PCIDevice *d))

{

    PCIBus *bus = first_bus;

    PCIDevice *d;

    int devfn;

    while (bus && bus->bus_num != bus_num)
        bus = bus->next;

    if (bus) {
        for(devfn = 0; devfn < 256; devfn++) {
            d = bus->devices[devfn];
            if (d)
                fn(d);
        }