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/*

 * QEMU SPARC iommu emulation

 *

 * Copyright (c) 2003-2005 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 "sun4m.h"

/* debug iommu */

//#define DEBUG_IOMMU

#ifdef DEBUG_IOMMU

#define DPRINTF(fmt, args...) \

do { printf("IOMMU: " fmt , ##args); } while (0)

#else

#define DPRINTF(fmt, args...)

#endif

#define IOMMU_NREGS (3*4096/4)

#define IOMMU_CTRL          (0x0000 >> 2)

#define IOMMU_CTRL_IMPL     0xf0000000 /* Implementation */

#define IOMMU_CTRL_VERS     0x0f000000 /* Version */

#define IOMMU_CTRL_RNGE     0x0000001c /* Mapping RANGE */

#define IOMMU_RNGE_16MB     0x00000000 /* 0xff000000 -> 0xffffffff */

#define IOMMU_RNGE_32MB     0x00000004 /* 0xfe000000 -> 0xffffffff */

#define IOMMU_RNGE_64MB     0x00000008 /* 0xfc000000 -> 0xffffffff */

#define IOMMU_RNGE_128MB    0x0000000c /* 0xf8000000 -> 0xffffffff */

#define IOMMU_RNGE_256MB    0x00000010 /* 0xf0000000 -> 0xffffffff */

#define IOMMU_RNGE_512MB    0x00000014 /* 0xe0000000 -> 0xffffffff */

#define IOMMU_RNGE_1GB      0x00000018 /* 0xc0000000 -> 0xffffffff */

#define IOMMU_RNGE_2GB      0x0000001c /* 0x80000000 -> 0xffffffff */

#define IOMMU_CTRL_ENAB     0x00000001 /* IOMMU Enable */

#define IOMMU_CTRL_MASK     0x0000001d

#define IOMMU_BASE          (0x0004 >> 2)

#define IOMMU_BASE_MASK     0x07fffc00

#define IOMMU_TLBFLUSH      (0x0014 >> 2)

#define IOMMU_TLBFLUSH_MASK 0xffffffff

#define IOMMU_PGFLUSH       (0x0018 >> 2)

#define IOMMU_PGFLUSH_MASK  0xffffffff

#define IOMMU_AFSR          (0x1000 >> 2)

#define IOMMU_AFSR_ERR      0x80000000 /* LE, TO, or BE asserted */

#define IOMMU_AFSR_LE       0x40000000 /* SBUS reports error after transaction */

#define IOMMU_AFSR_TO       0x20000000 /* Write access took more than 12.8 us. */

#define IOMMU_AFSR_BE       0x10000000 /* Write access received error acknowledge */

#define IOMMU_AFSR_SIZE     0x0e000000 /* Size of transaction causing error */

#define IOMMU_AFSR_S        0x01000000 /* Sparc was in supervisor mode */

#define IOMMU_AFSR_RESV     0x00f00000 /* Reserved, forced to 0x8 by hardware */

#define IOMMU_AFSR_ME       0x00080000 /* Multiple errors occurred */

#define IOMMU_AFSR_RD       0x00040000 /* A read operation was in progress */

#define IOMMU_AFSR_FAV      0x00020000 /* IOMMU afar has valid contents */

#define IOMMU_AFAR          (0x1004 >> 2)

#define IOMMU_SBCFG0        (0x1010 >> 2) /* SBUS configration per-slot */

#define IOMMU_SBCFG1        (0x1014 >> 2) /* SBUS configration per-slot */

#define IOMMU_SBCFG2        (0x1018 >> 2) /* SBUS configration per-slot */

#define IOMMU_SBCFG3        (0x101c >> 2) /* SBUS configration per-slot */

#define IOMMU_SBCFG_SAB30   0x00010000 /* Phys-address bit 30 when bypass enabled */

#define IOMMU_SBCFG_BA16    0x00000004 /* Slave supports 16 byte bursts */

#define IOMMU_SBCFG_BA8     0x00000002 /* Slave supports 8 byte bursts */

#define IOMMU_SBCFG_BYPASS  0x00000001 /* Bypass IOMMU, treat all addresses

                                          produced by this device as pure

                                          physical. */

#define IOMMU_SBCFG_MASK    0x00010003

#define IOMMU_ARBEN         (0x2000 >> 2) /* SBUS arbitration enable */

#define IOMMU_ARBEN_MASK    0x001f0000

#define IOMMU_MID           0x00000008

/* The format of an iopte in the page tables */

#define IOPTE_PAGE          0x07ffff00 /* Physical page number (PA[30:12]) */

#define IOPTE_CACHE         0x00000080 /* Cached (in vme IOCACHE or Viking/MXCC) */

#define IOPTE_WRITE         0x00000004 /* Writeable */

#define IOPTE_VALID         0x00000002 /* IOPTE is valid */

#define IOPTE_WAZ           0x00000001 /* Write as zeros */

#define PAGE_SHIFT      12

#define PAGE_SIZE       (1 << PAGE_SHIFT)

#define PAGE_MASK       (PAGE_SIZE - 1)

typedef struct IOMMUState {

    target_phys_addr_t addr;

    uint32_t regs[IOMMU_NREGS];

    target_phys_addr_t iostart;

    uint32_t version;

} IOMMUState;

static uint32_t iommu_mem_readw(void *opaque, target_phys_addr_t addr)

{

    IOMMUState *s = opaque;

    target_phys_addr_t saddr;

    saddr = (addr - s->addr) >> 2;

    switch (saddr) {

    default:

        DPRINTF("read reg[%d] = %x\n", (int)saddr, s->regs[saddr]);

        return s->regs[saddr];

        break;

    }

    return 0;

}

static void iommu_mem_writew(void *opaque, target_phys_addr_t addr, uint32_t val)

{

    IOMMUState *s = opaque;

    target_phys_addr_t saddr;

    saddr = (addr - s->addr) >> 2;

    DPRINTF("write reg[%d] = %x\n", (int)saddr, val);

    switch (saddr) {

    case IOMMU_CTRL:

        switch (val & IOMMU_CTRL_RNGE) {

        case IOMMU_RNGE_16MB:

            s->iostart = 0xffffffffff000000ULL;

            break;

        case IOMMU_RNGE_32MB:

            s->iostart = 0xfffffffffe000000ULL;

            break;

        case IOMMU_RNGE_64MB:

            s->iostart = 0xfffffffffc000000ULL;

            break;

        case IOMMU_RNGE_128MB:

            s->iostart = 0xfffffffff8000000ULL;

            break;

        case IOMMU_RNGE_256MB:

            s->iostart = 0xfffffffff0000000ULL;

            break;

        case IOMMU_RNGE_512MB:

            s->iostart = 0xffffffffe0000000ULL;

            break;

        case IOMMU_RNGE_1GB:

            s->iostart = 0xffffffffc0000000ULL;

            break;

        default:

        case IOMMU_RNGE_2GB:

            s->iostart = 0xffffffff80000000ULL;

            break;

        }

        DPRINTF("iostart = " TARGET_FMT_plx "\n", s->iostart);

        s->regs[saddr] = ((val & IOMMU_CTRL_MASK) | s->version);

        break;

    case IOMMU_BASE:

        s->regs[saddr] = val & IOMMU_BASE_MASK;

        break;

    case IOMMU_TLBFLUSH:

        DPRINTF("tlb flush %x\n", val);

        s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK;

        break;

    case IOMMU_PGFLUSH:

        DPRINTF("page flush %x\n", val);

        s->regs[saddr] = val & IOMMU_PGFLUSH_MASK;

        break;

    case IOMMU_SBCFG0:

    case IOMMU_SBCFG1:

    case IOMMU_SBCFG2:

    case IOMMU_SBCFG3:

        s->regs[saddr] = val & IOMMU_SBCFG_MASK;

        break;

    case IOMMU_ARBEN:

        // XXX implement SBus probing: fault when reading unmapped

        // addresses, fault cause and address stored to MMU/IOMMU

        s->regs[saddr] = (val & IOMMU_ARBEN_MASK) | IOMMU_MID;

        break;

    default:

        s->regs[saddr] = val;

        break;

    }

}

static CPUReadMemoryFunc *iommu_mem_read[3] = {

    iommu_mem_readw,

    iommu_mem_readw,

    iommu_mem_readw,

};

static CPUWriteMemoryFunc *iommu_mem_write[3] = {

    iommu_mem_writew,

    iommu_mem_writew,

    iommu_mem_writew,

};

static uint32_t iommu_page_get_flags(IOMMUState *s, target_phys_addr_t addr)

{

    uint32_t ret;

    target_phys_addr_t iopte;

#ifdef DEBUG_IOMMU

    target_phys_addr_t pa = addr;

#endif

    iopte = s->regs[IOMMU_BASE] << 4;

    addr &= ~s->iostart;

    iopte += (addr >> (PAGE_SHIFT - 2)) & ~3;

    cpu_physical_memory_read(iopte, (uint8_t *)&ret, 4);

    tswap32s(&ret);

    DPRINTF("get flags addr " TARGET_FMT_plx " => pte " TARGET_FMT_plx

            ", *pte = %x\n", pa, iopte, ret);

    return ret;

}

static target_phys_addr_t iommu_translate_pa(IOMMUState *s,

                                             target_phys_addr_t addr,

                                             uint32_t pte)

{

    uint32_t tmppte;

    target_phys_addr_t pa;

    tmppte = pte;

    pa = ((pte & IOPTE_PAGE) << 4) + (addr & PAGE_MASK);

    DPRINTF("xlate dva " TARGET_FMT_plx " => pa " TARGET_FMT_plx

            " (iopte = %x)\n", addr, pa, tmppte);

    return pa;

}

static void iommu_bad_addr(IOMMUState *s, target_phys_addr_t addr, int is_write)

{

    DPRINTF("bad addr " TARGET_FMT_plx "\n", addr);

    s->regs[IOMMU_AFSR] = IOMMU_AFSR_ERR | IOMMU_AFSR_LE | (8 << 20) |

        IOMMU_AFSR_FAV;

    if (!is_write)

        s->regs[IOMMU_AFSR] |= IOMMU_AFSR_RD;

    s->regs[IOMMU_AFAR] = addr;

}

void sparc_iommu_memory_rw(void *opaque, target_phys_addr_t addr,

                           uint8_t *buf, int len, int is_write)

{

    int l;

    uint32_t flags;

    target_phys_addr_t page, phys_addr;

    while (len > 0) {

        page = addr & TARGET_PAGE_MASK;

        l = (page + TARGET_PAGE_SIZE) - addr;

        if (l > len)

            l = len;

        flags = iommu_page_get_flags(opaque, page);

        if (!(flags & IOPTE_VALID)) {

            iommu_bad_addr(opaque, page, is_write);

            return;

        }

        phys_addr = iommu_translate_pa(opaque, addr, flags);

        if (is_write) {

            if (!(flags & IOPTE_WRITE)) {

                iommu_bad_addr(opaque, page, is_write);

                return;

            }

            cpu_physical_memory_write(phys_addr, buf, len);

        } else {

            cpu_physical_memory_read(phys_addr, buf, len);

        }

        len -= l;

        buf += l;

        addr += l;

    }

}

static void iommu_save(QEMUFile *f, void *opaque)

{

    IOMMUState *s = opaque;

    int i;

    for (i = 0; i < IOMMU_NREGS; i++)

        qemu_put_be32s(f, &s->regs[i]);

    qemu_put_be64s(f, &s->iostart);

}

static int iommu_load(QEMUFile *f, void *opaque, int version_id)

{

    IOMMUState *s = opaque;

    int i;

    if (version_id != 2)

        return -EINVAL;

    for (i = 0; i < IOMMU_NREGS; i++)

        qemu_get_be32s(f, &s->regs[i]);

    qemu_get_be64s(f, &s->iostart);

    return 0;

}

static void iommu_reset(void *opaque)

{

    IOMMUState *s = opaque;

    memset(s->regs, 0, IOMMU_NREGS * 4);

    s->iostart = 0;

    s->regs[IOMMU_CTRL] = s->version;

    s->regs[IOMMU_ARBEN] = IOMMU_MID;

}

void *iommu_init(target_phys_addr_t addr, uint32_t version)

{

    IOMMUState *s;

    int iommu_io_memory;

    s = qemu_mallocz(sizeof(IOMMUState));

    if (!s)

        return NULL;

    s->addr = addr;

    s->version = version;

    iommu_io_memory = cpu_register_io_memory(0, iommu_mem_read, iommu_mem_write, s);

    cpu_register_physical_memory(addr, IOMMU_NREGS * 4, iommu_io_memory);

    register_savevm("iommu", addr, 2, iommu_save, iommu_load, s);

    qemu_register_reset(iommu_reset, s);

    iommu_reset(s);

    return s;

}