/*

 * QEMU PowerPC 4xx embedded processors shared devices emulation

 *

 * Copyright (c) 2007 Jocelyn Mayer

 *

 * 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 "ppc.h"

#include "ppc4xx.h"

#include "sysemu.h"

#include "qemu-log.h"

//#define DEBUG_MMIO

//#define DEBUG_UNASSIGNED

#define DEBUG_UIC

/*****************************************************************************/

/* Generic PowerPC 4xx processor instanciation */

CPUState *ppc4xx_init (const char *cpu_model,

                       clk_setup_t *cpu_clk, clk_setup_t *tb_clk,

                       uint32_t sysclk)

{

    CPUState *env;

    /* init CPUs */

    env = cpu_init(cpu_model);

    if (!env) {

        fprintf(stderr, "Unable to find PowerPC %s CPU definition\n",

                cpu_model);

        exit(1);

    }

    cpu_clk->cb = NULL; /* We don't care about CPU clock frequency changes */

    cpu_clk->opaque = env;

    /* Set time-base frequency to sysclk */

    tb_clk->cb = ppc_emb_timers_init(env, sysclk);

    tb_clk->opaque = env;

    ppc_dcr_init(env, NULL, NULL);

    /* Register qemu callbacks */

    qemu_register_reset(&cpu_ppc_reset, env);

    return env;

}

/*****************************************************************************/

/* Fake device used to map multiple devices in a single memory page */

#define MMIO_AREA_BITS 8

#define MMIO_AREA_LEN (1 << MMIO_AREA_BITS)

#define MMIO_AREA_NB (1 << (TARGET_PAGE_BITS - MMIO_AREA_BITS))

#define MMIO_IDX(addr) (((addr) >> MMIO_AREA_BITS) & (MMIO_AREA_NB - 1))

struct ppc4xx_mmio_t {

    target_phys_addr_t base;

    CPUReadMemoryFunc **mem_read[MMIO_AREA_NB];

    CPUWriteMemoryFunc **mem_write[MMIO_AREA_NB];

    void *opaque[MMIO_AREA_NB];

};

static uint32_t unassigned_mmio_readb (void *opaque, target_phys_addr_t addr)

{

#ifdef DEBUG_UNASSIGNED

    ppc4xx_mmio_t *mmio;

    mmio = opaque;

    printf("Unassigned mmio read 0x" PADDRX " base " PADDRX "\n",

           addr, mmio->base);

#endif

    return 0;

}

static void unassigned_mmio_writeb (void *opaque,

                                    target_phys_addr_t addr, uint32_t val)

{

#ifdef DEBUG_UNASSIGNED

    ppc4xx_mmio_t *mmio;

    mmio = opaque;

    printf("Unassigned mmio write 0x" PADDRX " = 0x%x base " PADDRX "\n",

           addr, val, mmio->base);

#endif

}

static CPUReadMemoryFunc *unassigned_mmio_read[3] = {

    unassigned_mmio_readb,

    unassigned_mmio_readb,

    unassigned_mmio_readb,

};

static CPUWriteMemoryFunc *unassigned_mmio_write[3] = {

    unassigned_mmio_writeb,

    unassigned_mmio_writeb,

    unassigned_mmio_writeb,

};

static uint32_t mmio_readlen (ppc4xx_mmio_t *mmio,

                              target_phys_addr_t addr, int len)

{

    CPUReadMemoryFunc **mem_read;

    uint32_t ret;

    int idx;

    idx = MMIO_IDX(addr);

#if defined(DEBUG_MMIO)

    printf("%s: mmio %p len %d addr " PADDRX " idx %d\n", __func__,

           mmio, len, addr, idx);

#endif

    mem_read = mmio->mem_read[idx];

    ret = (*mem_read[len])(mmio->opaque[idx], addr);

    return ret;

}

static void mmio_writelen (ppc4xx_mmio_t *mmio,

                           target_phys_addr_t addr, uint32_t value, int len)

{

    CPUWriteMemoryFunc **mem_write;

    int idx;

    idx = MMIO_IDX(addr);

#if defined(DEBUG_MMIO)

    printf("%s: mmio %p len %d addr " PADDRX " idx %d value %08" PRIx32 "\n",

           __func__, mmio, len, addr, idx, value);

#endif

    mem_write = mmio->mem_write[idx];

    (*mem_write[len])(mmio->opaque[idx], addr, value);

}

static uint32_t mmio_readb (void *opaque, target_phys_addr_t addr)

{

#if defined(DEBUG_MMIO)

    printf("%s: addr " PADDRX "\n", __func__, addr);

#endif

    return mmio_readlen(opaque, addr, 0);

}

static void mmio_writeb (void *opaque,

                         target_phys_addr_t addr, uint32_t value)

{

#if defined(DEBUG_MMIO)

    printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);

#endif

    mmio_writelen(opaque, addr, value, 0);

}

static uint32_t mmio_readw (void *opaque, target_phys_addr_t addr)

{

#if defined(DEBUG_MMIO)

    printf("%s: addr " PADDRX "\n", __func__, addr);

#endif

    return mmio_readlen(opaque, addr, 1);

}

static void mmio_writew (void *opaque,

                         target_phys_addr_t addr, uint32_t value)

{

#if defined(DEBUG_MMIO)

    printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);

#endif

    mmio_writelen(opaque, addr, value, 1);

}

static uint32_t mmio_readl (void *opaque, target_phys_addr_t addr)

{

#if defined(DEBUG_MMIO)

    printf("%s: addr " PADDRX "\n", __func__, addr);

#endif

    return mmio_readlen(opaque, addr, 2);

}

static void mmio_writel (void *opaque,

                         target_phys_addr_t addr, uint32_t value)

{

#if defined(DEBUG_MMIO)

    printf("%s: addr " PADDRX " val %08" PRIx32 "\n", __func__, addr, value);

#endif

    mmio_writelen(opaque, addr, value, 2);

}

static CPUReadMemoryFunc *mmio_read[] = {

    &mmio_readb,

    &mmio_readw,

    &mmio_readl,

};

static CPUWriteMemoryFunc *mmio_write[] = {

    &mmio_writeb,

    &mmio_writew,

    &mmio_writel,

};

int ppc4xx_mmio_register (CPUState *env, ppc4xx_mmio_t *mmio,

                          target_phys_addr_t offset, uint32_t len,

                          CPUReadMemoryFunc **mem_read,

                          CPUWriteMemoryFunc **mem_write, void *opaque)

{

    target_phys_addr_t end;

    int idx, eidx;

    if ((offset + len) > TARGET_PAGE_SIZE)

        return -1;

    idx = MMIO_IDX(offset);

    end = offset + len - 1;

    eidx = MMIO_IDX(end);

#if defined(DEBUG_MMIO)

    printf("%s: offset " PADDRX " len %08" PRIx32 " " PADDRX " %d %d\n",

           __func__, offset, len, end, idx, eidx);

#endif

    for (; idx <= eidx; idx++) {

        mmio->mem_read[idx] = mem_read;

        mmio->mem_write[idx] = mem_write;

        mmio->opaque[idx] = opaque;

    }

    return 0;

}

ppc4xx_mmio_t *ppc4xx_mmio_init (CPUState *env, target_phys_addr_t base)

{

    ppc4xx_mmio_t *mmio;

    int mmio_memory;

    mmio = qemu_mallocz(sizeof(ppc4xx_mmio_t));

    if (mmio != NULL) {

        mmio->base = base;

        mmio_memory = cpu_register_io_memory(0, mmio_read, mmio_write, mmio);

#if defined(DEBUG_MMIO)

        printf("%s: base " PADDRX " len %08x %d\n", __func__,

               base, TARGET_PAGE_SIZE, mmio_memory);

#endif

        cpu_register_physical_memory(base, TARGET_PAGE_SIZE, mmio_memory);

        ppc4xx_mmio_register(env, mmio, 0, TARGET_PAGE_SIZE,

                             unassigned_mmio_read, unassigned_mmio_write,

                             mmio);

    }

    return mmio;

}

/*****************************************************************************/

/* "Universal" Interrupt controller */

enum {

    DCR_UICSR  = 0x000,

    DCR_UICSRS = 0x001,

    DCR_UICER  = 0x002,

    DCR_UICCR  = 0x003,

    DCR_UICPR  = 0x004,

    DCR_UICTR  = 0x005,

    DCR_UICMSR = 0x006,

    DCR_UICVR  = 0x007,

    DCR_UICVCR = 0x008,

    DCR_UICMAX = 0x009,

};

#define UIC_MAX_IRQ 32

typedef struct ppcuic_t ppcuic_t;

struct ppcuic_t {

    uint32_t dcr_base;

    int use_vectors;

    uint32_t level;  /* Remembers the state of level-triggered interrupts. */

    uint32_t uicsr;  /* Status register */

    uint32_t uicer;  /* Enable register */

    uint32_t uiccr;  /* Critical register */

    uint32_t uicpr;  /* Polarity register */

    uint32_t uictr;  /* Triggering register */

    uint32_t uicvcr; /* Vector configuration register */

    uint32_t uicvr;

    qemu_irq *irqs;

};

static void ppcuic_trigger_irq (ppcuic_t *uic)

{

    uint32_t ir, cr;

    int start, end, inc, i;

    /* Trigger interrupt if any is pending */

    ir = uic->uicsr & uic->uicer & (~uic->uiccr);

    cr = uic->uicsr & uic->uicer & uic->uiccr;

#ifdef DEBUG_UIC

    if (loglevel & CPU_LOG_INT) {

        fprintf(logfile, "%s: uicsr %08" PRIx32 " uicer %08" PRIx32

                " uiccr %08" PRIx32 "\n"

                "   %08" PRIx32 " ir %08" PRIx32 " cr %08" PRIx32 "\n",

                __func__, uic->uicsr, uic->uicer, uic->uiccr,

                uic->uicsr & uic->uicer, ir, cr);

    }

#endif

    if (ir != 0x0000000) {

#ifdef DEBUG_UIC

        if (loglevel & CPU_LOG_INT) {

            fprintf(logfile, "Raise UIC interrupt\n");

        }

#endif

        qemu_irq_raise(uic->irqs[PPCUIC_OUTPUT_INT]);

    } else {

#ifdef DEBUG_UIC

        if (loglevel & CPU_LOG_INT) {

            fprintf(logfile, "Lower UIC interrupt\n");

        }

#endif

        qemu_irq_lower(uic->irqs[PPCUIC_OUTPUT_INT]);

    }

    /* Trigger critical interrupt if any is pending and update vector */

    if (cr != 0x0000000) {

        qemu_irq_raise(uic->irqs[PPCUIC_OUTPUT_CINT]);

        if (uic->use_vectors) {

            /* Compute critical IRQ vector */

            if (uic->uicvcr & 1) {

                start = 31;

                end = 0;

                inc = -1;

            } else {

                start = 0;

                end = 31;

                inc = 1;

            }

            uic->uicvr = uic->uicvcr & 0xFFFFFFFC;

            for (i = start; i <= end; i += inc) {

                if (cr & (1 << i)) {

                    uic->uicvr += (i - start) * 512 * inc;

                    break;

                }

            }

        }

#ifdef DEBUG_UIC

        if (loglevel & CPU_LOG_INT) {

            fprintf(logfile, "Raise UIC critical interrupt - "

                    "vector %08" PRIx32 "\n", uic->uicvr);

        }

#endif

    } else {

#ifdef DEBUG_UIC

        if (loglevel & CPU_LOG_INT) {

            fprintf(logfile, "Lower UIC critical interrupt\n");

        }

#endif

        qemu_irq_lower(uic->irqs[PPCUIC_OUTPUT_CINT]);

        uic->uicvr = 0x00000000;

    }

}

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

{

    ppcuic_t *uic;

    uint32_t mask, sr;

    uic = opaque;

    mask = 1 << (31-irq_num);

#ifdef DEBUG_UIC

    if (loglevel & CPU_LOG_INT) {

        fprintf(logfile, "%s: irq %d level %d uicsr %08" PRIx32

                " mask %08" PRIx32 " => %08" PRIx32 " %08" PRIx32 "\n",

                __func__, irq_num, level,

                uic->uicsr, mask, uic->uicsr & mask, level << irq_num);

    }

#endif

    if (irq_num < 0 || irq_num > 31)

        return;

    sr = uic->uicsr;

    /* Update status register */

    if (uic->uictr & mask) {

        /* Edge sensitive interrupt */

        if (level == 1)

            uic->uicsr |= mask;

    } else {

        /* Level sensitive interrupt */

        if (level == 1) {

            uic->uicsr |= mask;

            uic->level |= mask;

        } else {

            uic->uicsr &= ~mask;

            uic->level &= ~mask;

        }

    }

#ifdef DEBUG_UIC

    if (loglevel & CPU_LOG_INT) {

        fprintf(logfile, "%s: irq %d level %d sr %" PRIx32 " => "

                "%08" PRIx32 "\n", __func__, irq_num, level, uic->uicsr, sr);

    }

#endif

    if (sr != uic->uicsr)

        ppcuic_trigger_irq(uic);

}

static target_ulong dcr_read_uic (void *opaque, int dcrn)

{

    ppcuic_t *uic;

    target_ulong ret;

    uic = opaque;

    dcrn -= uic->dcr_base;

    switch (dcrn) {

    case DCR_UICSR:

    case DCR_UICSRS:

        ret = uic->uicsr;

        break;

    case DCR_UICER:

        ret = uic->uicer;

        break;

    case DCR_UICCR:

        ret = uic->uiccr;

        break;

    case DCR_UICPR:

        ret = uic->uicpr;

        break;

    case DCR_UICTR:

        ret = uic->uictr;

        break;

    case DCR_UICMSR:

        ret = uic->uicsr & uic->uicer;

        break;

    case DCR_UICVR:

        if (!uic->use_vectors)

            goto no_read;

        ret = uic->uicvr;

        break;

    case DCR_UICVCR:

        if (!uic->use_vectors)

            goto no_read;

        ret = uic->uicvcr;

        break;

    default:

    no_read:

        ret = 0x00000000;

        break;

    }

    return ret;

}

static void dcr_write_uic (void *opaque, int dcrn, target_ulong val)

{

    ppcuic_t *uic;

    uic = opaque;

    dcrn -= uic->dcr_base;

#ifdef DEBUG_UIC

    if (loglevel & CPU_LOG_INT) {

        fprintf(logfile, "%s: dcr %d val " ADDRX "\n", __func__, dcrn, val);

    }

#endif

    switch (dcrn) {

    case DCR_UICSR:

        uic->uicsr &= ~val;

        uic->uicsr |= uic->level;

        ppcuic_trigger_irq(uic);

        break;

    case DCR_UICSRS:

        uic->uicsr |= val;

        ppcuic_trigger_irq(uic);

        break;

    case DCR_UICER:

        uic->uicer = val;

        ppcuic_trigger_irq(uic);

        break;

    case DCR_UICCR:

        uic->uiccr = val;

        ppcuic_trigger_irq(uic);

        break;

    case DCR_UICPR:

        uic->uicpr = val;

        break;

    case DCR_UICTR:

        uic->uictr = val;

        ppcuic_trigger_irq(uic);

        break;

    case DCR_UICMSR:

        break;

    case DCR_UICVR:

        break;

    case DCR_UICVCR:

        uic->uicvcr = val & 0xFFFFFFFD;

        ppcuic_trigger_irq(uic);

        break;

    }

}

static void ppcuic_reset (void *opaque)

{

    ppcuic_t *uic;

    uic = opaque;

    uic->uiccr = 0x00000000;

    uic->uicer = 0x00000000;

    uic->uicpr = 0x00000000;

    uic->uicsr = 0x00000000;

    uic->uictr = 0x00000000;

    if (uic->use_vectors) {

        uic->uicvcr = 0x00000000;

        uic->uicvr = 0x0000000;

    }

}

qemu_irq *ppcuic_init (CPUState *env, qemu_irq *irqs,

                       uint32_t dcr_base, int has_ssr, int has_vr)

{

    ppcuic_t *uic;

    int i;

    uic = qemu_mallocz(sizeof(ppcuic_t));

    if (uic != NULL) {

        uic->dcr_base = dcr_base;

        uic->irqs = irqs;

        if (has_vr)

            uic->use_vectors = 1;

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

            ppc_dcr_register(env, dcr_base + i, uic,

                             &dcr_read_uic, &dcr_write_uic);

        }