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/*

 * QEMU Ultrasparc APB PCI host

 *

 * Copyright (c) 2006 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.

 */

/* XXX This file and most of its contents are somewhat misnamed.  The

   Ultrasparc PCI host is called the PCI Bus Module (PBM).  The APB is

   the secondary PCI bridge.  */

#include "sysbus.h"

#include "pci.h"

#include "pci_host.h"

#include "apb_pci.h"

/* debug APB */

//#define DEBUG_APB

#ifdef DEBUG_APB

#define APB_DPRINTF(fmt, ...) \

do { printf("APB: " fmt , ## __VA_ARGS__); } while (0)

#else

#define APB_DPRINTF(fmt, ...)

#endif

/*

 * Chipset docs:

 * PBM: "UltraSPARC IIi User's Manual",

 * http://www.sun.com/processors/manuals/805-0087.pdf

 *

 * APB: "Advanced PCI Bridge (APB) User's Manual",

 * http://www.sun.com/processors/manuals/805-1251.pdf

 */

#define PBM_PCI_IMR_MASK    0x7fffffff

#define PBM_PCI_IMR_ENABLED 0x80000000

#define POR          (1 << 31)

#define SOFT_POR     (1 << 30)

#define SOFT_XIR     (1 << 29)

#define BTN_POR      (1 << 28)

#define BTN_XIR      (1 << 27)

#define RESET_MASK   0xf8000000

#define RESET_WCMASK 0x98000000

#define RESET_WMASK  0x60000000

typedef struct APBState {

    SysBusDevice busdev;

    PCIHostState host_state;

    uint32_t iommu[4];

    uint32_t pci_control[16];

    uint32_t pci_irq_map[8];

    uint32_t obio_irq_map[32];

    qemu_irq pci_irqs[32];

    uint32_t reset_control;

} APBState;

static unsigned int nr_resets;

static void apb_config_writel (void *opaque, target_phys_addr_t addr,

                               uint32_t val)

{

    APBState *s = opaque;

    APB_DPRINTF("%s: addr " TARGET_FMT_lx " val %x\n", __func__, addr, val);

    switch (addr & 0xffff) {

    case 0x30 ... 0x4f: /* DMA error registers */

        /* XXX: not implemented yet */

        break;

    case 0x200 ... 0x20b: /* IOMMU */

        s->iommu[(addr & 0xf) >> 2] = val;

        break;

    case 0x20c ... 0x3ff: /* IOMMU flush */

        break;

    case 0xc00 ... 0xc3f: /* PCI interrupt control */

        if (addr & 4) {

            s->pci_irq_map[(addr & 0x3f) >> 3] &= PBM_PCI_IMR_MASK;

            s->pci_irq_map[(addr & 0x3f) >> 3] |= val & ~PBM_PCI_IMR_MASK;

        }

        break;

    case 0x2000 ... 0x202f: /* PCI control */

        s->pci_control[(addr & 0x3f) >> 2] = val;

        break;

    case 0xf020 ... 0xf027: /* Reset control */

        if (addr & 4) {

            val &= RESET_MASK;

            s->reset_control &= ~(val & RESET_WCMASK);

            s->reset_control |= val & RESET_WMASK;

            if (val & SOFT_POR) {

                nr_resets = 0;

                qemu_system_reset_request();

            } else if (val & SOFT_XIR) {

                qemu_system_reset_request();

            }

        }

        break;

    case 0x5000 ... 0x51cf: /* PIO/DMA diagnostics */

    case 0xa400 ... 0xa67f: /* IOMMU diagnostics */

    case 0xa800 ... 0xa80f: /* Interrupt diagnostics */

    case 0xf000 ... 0xf01f: /* FFB config, memory control */

        /* we don't care */

    default:

        break;

    }

}

static uint32_t apb_config_readl (void *opaque,

                                  target_phys_addr_t addr)

{

    APBState *s = opaque;

    uint32_t val;

    switch (addr & 0xffff) {

    case 0x30 ... 0x4f: /* DMA error registers */

        val = 0;

        /* XXX: not implemented yet */

        break;

    case 0x200 ... 0x20b: /* IOMMU */

        val = s->iommu[(addr & 0xf) >> 2];

        break;

    case 0x20c ... 0x3ff: /* IOMMU flush */

        val = 0;

        break;

    case 0xc00 ... 0xc3f: /* PCI interrupt control */

        if (addr & 4) {

            val = s->pci_irq_map[(addr & 0x3f) >> 3];

        } else {

            val = 0;

        }

        break;

    case 0x2000 ... 0x202f: /* PCI control */

        val = s->pci_control[(addr & 0x3f) >> 2];

        break;

    case 0xf020 ... 0xf027: /* Reset control */

        if (addr & 4) {

            val = s->reset_control;

        } else {

            val = 0;

        }

        break;

    case 0x5000 ... 0x51cf: /* PIO/DMA diagnostics */

    case 0xa400 ... 0xa67f: /* IOMMU diagnostics */

    case 0xa800 ... 0xa80f: /* Interrupt diagnostics */

    case 0xf000 ... 0xf01f: /* FFB config, memory control */

        /* we don't care */

    default:

        val = 0;

        break;

    }

    APB_DPRINTF("%s: addr " TARGET_FMT_lx " -> %x\n", __func__, addr, val);

    return val;

}

static CPUWriteMemoryFunc * const apb_config_write[] = {

    &apb_config_writel,

    &apb_config_writel,

    &apb_config_writel,

};

static CPUReadMemoryFunc * const apb_config_read[] = {

    &apb_config_readl,

    &apb_config_readl,

    &apb_config_readl,

};

static void apb_pci_config_write(APBState *s, target_phys_addr_t addr,

                                 uint32_t val, int size)

{

    APB_DPRINTF("%s: addr " TARGET_FMT_lx " val %x\n", __func__, addr, val);

    pci_data_write(s->host_state.bus, (addr & 0x00ffffff) | (1u << 31), val,

                   size);

}

static uint32_t apb_pci_config_read(APBState *s, target_phys_addr_t addr,

                                    int size)

{

    uint32_t ret;

    ret = pci_data_read(s->host_state.bus, (addr & 0x00ffffff) | (1u << 31),

                        size);

    APB_DPRINTF("%s: addr " TARGET_FMT_lx " -> %x\n", __func__, addr, ret);

    return ret;

}

static void apb_pci_config_writel(void *opaque, target_phys_addr_t addr,

                                  uint32_t val)

{

    APBState *s = opaque;

    apb_pci_config_write(s, addr, bswap32(val), 4);

}

static void apb_pci_config_writew(void *opaque, target_phys_addr_t addr,

                                  uint32_t val)

{

    APBState *s = opaque;

    apb_pci_config_write(s, addr, bswap16(val), 2);

}

static void apb_pci_config_writeb(void *opaque, target_phys_addr_t addr,

                                  uint32_t val)

{

    APBState *s = opaque;

    apb_pci_config_write(s, addr, val, 1);

}

static uint32_t apb_pci_config_readl(void *opaque, target_phys_addr_t addr)

{

    APBState *s = opaque;

    return bswap32(apb_pci_config_read(s, addr, 4));

}

static uint32_t apb_pci_config_readw(void *opaque, target_phys_addr_t addr)

{

    APBState *s = opaque;

    return bswap16(apb_pci_config_read(s, addr, 2));

}

static uint32_t apb_pci_config_readb(void *opaque, target_phys_addr_t addr)

{

    APBState *s = opaque;

    return apb_pci_config_read(s, addr, 1);

}

static CPUWriteMemoryFunc * const apb_pci_config_writes[] = {

    &apb_pci_config_writeb,

    &apb_pci_config_writew,

    &apb_pci_config_writel,

};

static CPUReadMemoryFunc * const apb_pci_config_reads[] = {

    &apb_pci_config_readb,

    &apb_pci_config_readw,

    &apb_pci_config_readl,

};

static void pci_apb_iowriteb (void *opaque, target_phys_addr_t addr,

                                  uint32_t val)

{

    cpu_outb(addr & IOPORTS_MASK, val);

}

static void pci_apb_iowritew (void *opaque, target_phys_addr_t addr,

                                  uint32_t val)

{

    cpu_outw(addr & IOPORTS_MASK, bswap16(val));

}

static void pci_apb_iowritel (void *opaque, target_phys_addr_t addr,

                                uint32_t val)

{

    cpu_outl(addr & IOPORTS_MASK, bswap32(val));

}

static uint32_t pci_apb_ioreadb (void *opaque, target_phys_addr_t addr)

{

    uint32_t val;

    val = cpu_inb(addr & IOPORTS_MASK);

    return val;

}

static uint32_t pci_apb_ioreadw (void *opaque, target_phys_addr_t addr)

{

    uint32_t val;

    val = bswap16(cpu_inw(addr & IOPORTS_MASK));

    return val;

}

static uint32_t pci_apb_ioreadl (void *opaque, target_phys_addr_t addr)

{

    uint32_t val;

    val = bswap32(cpu_inl(addr & IOPORTS_MASK));

    return val;

}

static CPUWriteMemoryFunc * const pci_apb_iowrite[] = {

    &pci_apb_iowriteb,

    &pci_apb_iowritew,

    &pci_apb_iowritel,

};

static CPUReadMemoryFunc * const pci_apb_ioread[] = {

    &pci_apb_ioreadb,

    &pci_apb_ioreadw,

    &pci_apb_ioreadl,

};

/* The APB host has an IRQ line for each IRQ line of each slot.  */

static int pci_apb_map_irq(PCIDevice *pci_dev, int irq_num)

{

    return ((pci_dev->devfn & 0x18) >> 1) + irq_num;

}

static int pci_pbm_map_irq(PCIDevice *pci_dev, int irq_num)

{

    int bus_offset;

    if (pci_dev->devfn & 1)

        bus_offset = 16;

    else

        bus_offset = 0;

    return bus_offset + irq_num;

}

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

{

    APBState *s = opaque;

    /* PCI IRQ map onto the first 32 INO.  */

    if (irq_num < 32) {

        if (s->pci_irq_map[irq_num >> 2] & PBM_PCI_IMR_ENABLED) {

            APB_DPRINTF("%s: set irq %d level %d\n", __func__, irq_num, level);

            qemu_set_irq(s->pci_irqs[irq_num], level);

        } else {

            APB_DPRINTF("%s: not enabled: lower irq %d\n", __func__, irq_num);

            qemu_irq_lower(s->pci_irqs[irq_num]);

        }

    }

}

static void apb_pci_bridge_init(PCIBus *b)

{

    PCIDevice *dev = pci_bridge_get_device(b);

    /*

     * command register:

     * According to PCI bridge spec, after reset

     *   bus master bit is off

     *   memory space enable bit is off

     * According to manual (805-1251.pdf).

     *   the reset value should be zero unless the boot pin is tied high

     *   (which is true) and thus it should be PCI_COMMAND_MEMORY.

     */

    pci_set_word(dev->config + PCI_COMMAND,

                 PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);

    dev->config[PCI_LATENCY_TIMER] = 0x10;

    dev->config[PCI_HEADER_TYPE] |= PCI_HEADER_TYPE_MULTI_FUNCTION;

}

PCIBus *pci_apb_init(target_phys_addr_t special_base,

                     target_phys_addr_t mem_base,

                     qemu_irq *pic, PCIBus **bus2, PCIBus **bus3)

{

    DeviceState *dev;

    SysBusDevice *s;

    APBState *d;

    unsigned int i;

    /* Ultrasparc PBM main bus */

    dev = qdev_create(NULL, "pbm");

    qdev_init_nofail(dev);

    s = sysbus_from_qdev(dev);

    /* apb_config */

    sysbus_mmio_map(s, 0, special_base);

    /* pci_ioport */

    sysbus_mmio_map(s, 1, special_base + 0x2000000ULL);

    /* pci_config */

    sysbus_mmio_map(s, 2, special_base + 0x1000000ULL);

    /* mem_data */

    sysbus_mmio_map(s, 3, mem_base);

    d = FROM_SYSBUS(APBState, s);

    d->host_state.bus = pci_register_bus(&d->busdev.qdev, "pci",

                                         pci_apb_set_irq, pci_pbm_map_irq, d,

                                         0, 32);

    pci_bus_set_mem_base(d->host_state.bus, mem_base);

    for (i = 0; i < 32; i++) {

        sysbus_connect_irq(s, i, pic[i]);

    }

    pci_create_simple(d->host_state.bus, 0, "pbm");

    /* APB secondary busses */

    *bus2 = pci_bridge_init(d->host_state.bus, PCI_DEVFN(1, 0),

                            PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_SIMBA,

                            pci_apb_map_irq,

                            "Advanced PCI Bus secondary bridge 1");

    apb_pci_bridge_init(*bus2);

    *bus3 = pci_bridge_init(d->host_state.bus, PCI_DEVFN(1, 1),

                            PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_SIMBA,

                            pci_apb_map_irq,

                            "Advanced PCI Bus secondary bridge 2");

    apb_pci_bridge_init(*bus3);

    return d->host_state.bus;

}

static void pci_pbm_reset(DeviceState *d)

{

    unsigned int i;

    APBState *s = container_of(d, APBState, busdev.qdev);

    for (i = 0; i < 8; i++) {

        s->pci_irq_map[i] &= PBM_PCI_IMR_MASK;

    }

    if (nr_resets++ == 0) {

        /* Power on reset */

        s->reset_control = POR;

    }

}

static int pci_pbm_init_device(SysBusDevice *dev)

{

    APBState *s;

    int pci_mem_data, apb_config, pci_ioport, pci_config;

    unsigned int i;

    s = FROM_SYSBUS(APBState, dev);

    for (i = 0; i < 8; i++) {

        s->pci_irq_map[i] = (0x1f << 6) | (i << 2);

    }

    for (i = 0; i < 32; i++) {

        sysbus_init_irq(dev, &s->pci_irqs[i]);

    }

    /* apb_config */

    apb_config = cpu_register_io_memory(apb_config_read,

                                        apb_config_write, s);

    sysbus_init_mmio(dev, 0x10000ULL, apb_config);

    /* pci_ioport */

    pci_ioport = cpu_register_io_memory(pci_apb_ioread,

                                          pci_apb_iowrite, s);

    sysbus_init_mmio(dev, 0x10000ULL, pci_ioport);

    /* pci_config */

    pci_config = cpu_register_io_memory(apb_pci_config_reads,

                                        apb_pci_config_writes, s);

    sysbus_init_mmio(dev, 0x1000000ULL, pci_config);

    /* mem_data */

    pci_mem_data = pci_host_data_register_mmio(&s->host_state);

    sysbus_init_mmio(dev, 0x10000000ULL, pci_mem_data);

    return 0;

}

static int pbm_pci_host_init(PCIDevice *d)

{

    pci_config_set_vendor_id(d->config, PCI_VENDOR_ID_SUN);

    pci_config_set_device_id(d->config, PCI_DEVICE_ID_SUN_SABRE);

    d->config[0x04] = 0x06; // command = bus master, pci mem

    d->config[0x05] = 0x00;

    d->config[0x06] = 0xa0; // status = fast back-to-back, 66MHz, no error

    d->config[0x07] = 0x03; // status = medium devsel

    d->config[0x08] = 0x00; // revision

    d->config[0x09] = 0x00; // programming i/f

    pci_config_set_class(d->config, PCI_CLASS_BRIDGE_HOST);

    d->config[0x0D] = 0x10; // latency_timer

    d->config[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL; // header_type

    return 0;

}

static PCIDeviceInfo pbm_pci_host_info = {

    .qdev.name = "pbm",

    .qdev.size = sizeof(PCIDevice),

    .init      = pbm_pci_host_init,

    .header_type  = PCI_HEADER_TYPE_BRIDGE,

};

static SysBusDeviceInfo pbm_host_info = {

    .qdev.name = "pbm",

    .qdev.size = sizeof(APBState),

    .qdev.reset = pci_pbm_reset,

    .init = pci_pbm_init_device,

};

static void pbm_register_devices(void)

{

    sysbus_register_withprop(&pbm_host_info);

    pci_qdev_register(&pbm_pci_host_info);

}

device_init(pbm_register_devices)