Archipelago » qemu

/*

 * Motorola ColdFire MCF5208 SoC emulation.

 *

 * Copyright (c) 2007 CodeSourcery.

 *

 * This code is licensed under the GPL

 */

#include "hw.h"

#include "mcf.h"

#include "qemu-timer.h"

#include "ptimer.h"

#include "sysemu.h"

#include "net.h"

#include "boards.h"

#include "loader.h"

#include "elf.h"

#include "exec-memory.h"

#define SYS_FREQ 66000000

#define PCSR_EN         0x0001

#define PCSR_RLD        0x0002

#define PCSR_PIF        0x0004

#define PCSR_PIE        0x0008

#define PCSR_OVW        0x0010

#define PCSR_DBG        0x0020

#define PCSR_DOZE       0x0040

#define PCSR_PRE_SHIFT  8

#define PCSR_PRE_MASK   0x0f00

typedef struct {

    MemoryRegion iomem;

    qemu_irq irq;

    ptimer_state *timer;

    uint16_t pcsr;

    uint16_t pmr;

    uint16_t pcntr;

} m5208_timer_state;

static void m5208_timer_update(m5208_timer_state *s)

{

    if ((s->pcsr & (PCSR_PIE | PCSR_PIF)) == (PCSR_PIE | PCSR_PIF))

        qemu_irq_raise(s->irq);

    else

        qemu_irq_lower(s->irq);

}

static void m5208_timer_write(void *opaque, hwaddr offset,

                              uint64_t value, unsigned size)

{

    m5208_timer_state *s = (m5208_timer_state *)opaque;

    int prescale;

    int limit;

    switch (offset) {

    case 0:

        /* The PIF bit is set-to-clear.  */

        if (value & PCSR_PIF) {

            s->pcsr &= ~PCSR_PIF;

            value &= ~PCSR_PIF;

        }

        /* Avoid frobbing the timer if we're just twiddling IRQ bits. */

        if (((s->pcsr ^ value) & ~PCSR_PIE) == 0) {

            s->pcsr = value;

            m5208_timer_update(s);

            return;

        }

        if (s->pcsr & PCSR_EN)

            ptimer_stop(s->timer);

        s->pcsr = value;

        prescale = 1 << ((s->pcsr & PCSR_PRE_MASK) >> PCSR_PRE_SHIFT);

        ptimer_set_freq(s->timer, (SYS_FREQ / 2) / prescale);

        if (s->pcsr & PCSR_RLD)

            limit = s->pmr;

        else

            limit = 0xffff;

        ptimer_set_limit(s->timer, limit, 0);

        if (s->pcsr & PCSR_EN)

            ptimer_run(s->timer, 0);

        break;

    case 2:

        s->pmr = value;

        s->pcsr &= ~PCSR_PIF;

        if ((s->pcsr & PCSR_RLD) == 0) {

            if (s->pcsr & PCSR_OVW)

                ptimer_set_count(s->timer, value);

        } else {

            ptimer_set_limit(s->timer, value, s->pcsr & PCSR_OVW);

        }

        break;

    case 4:

        break;

    default:

        hw_error("m5208_timer_write: Bad offset 0x%x\n", (int)offset);

        break;

    }

    m5208_timer_update(s);

}

static void m5208_timer_trigger(void *opaque)

{

    m5208_timer_state *s = (m5208_timer_state *)opaque;

    s->pcsr |= PCSR_PIF;

    m5208_timer_update(s);

}

static uint64_t m5208_timer_read(void *opaque, hwaddr addr,

                                 unsigned size)

{

    m5208_timer_state *s = (m5208_timer_state *)opaque;

    switch (addr) {

    case 0:

        return s->pcsr;

    case 2:

        return s->pmr;

    case 4:

        return ptimer_get_count(s->timer);

    default:

        hw_error("m5208_timer_read: Bad offset 0x%x\n", (int)addr);

        return 0;

    }

}

static const MemoryRegionOps m5208_timer_ops = {

    .read = m5208_timer_read,

    .write = m5208_timer_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static uint64_t m5208_sys_read(void *opaque, hwaddr addr,

                               unsigned size)

{

    switch (addr) {

    case 0x110: /* SDCS0 */

        {

            int n;

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

                if (ram_size < (2u << n))

                    break;

            }

            return (n - 1)  | 0x40000000;

        }

    case 0x114: /* SDCS1 */

        return 0;

    default:

        hw_error("m5208_sys_read: Bad offset 0x%x\n", (int)addr);

        return 0;

    }

}

static void m5208_sys_write(void *opaque, hwaddr addr,

                            uint64_t value, unsigned size)

{

    hw_error("m5208_sys_write: Bad offset 0x%x\n", (int)addr);

}

static const MemoryRegionOps m5208_sys_ops = {

    .read = m5208_sys_read,

    .write = m5208_sys_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)

{

    MemoryRegion *iomem = g_new(MemoryRegion, 1);

    m5208_timer_state *s;

    QEMUBH *bh;

    int i;

    /* SDRAMC.  */

    memory_region_init_io(iomem, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);

    memory_region_add_subregion(address_space, 0xfc0a8000, iomem);

    /* Timers.  */

    for (i = 0; i < 2; i++) {

        s = (m5208_timer_state *)g_malloc0(sizeof(m5208_timer_state));

        bh = qemu_bh_new(m5208_timer_trigger, s);

        s->timer = ptimer_init(bh);

        memory_region_init_io(&s->iomem, &m5208_timer_ops, s,

                              "m5208-timer", 0x00004000);

        memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,

                                    &s->iomem);

        s->irq = pic[4 + i];

    }

}

static void mcf5208evb_init(QEMUMachineInitArgs *args)

{

    ram_addr_t ram_size = args->ram_size;

    const char *cpu_model = args->cpu_model;

    const char *kernel_filename = args->kernel_filename;

    CPUM68KState *env;

    int kernel_size;

    uint64_t elf_entry;

    hwaddr entry;

    qemu_irq *pic;

    MemoryRegion *address_space_mem = get_system_memory();

    MemoryRegion *ram = g_new(MemoryRegion, 1);

    MemoryRegion *sram = g_new(MemoryRegion, 1);

    if (!cpu_model)

        cpu_model = "m5208";

    env = cpu_init(cpu_model);

    if (!env) {

        fprintf(stderr, "Unable to find m68k CPU definition\n");

        exit(1);

    }

    /* Initialize CPU registers.  */

    env->vbr = 0;

    /* TODO: Configure BARs.  */

    /* DRAM at 0x40000000 */

    memory_region_init_ram(ram, "mcf5208.ram", ram_size);

    vmstate_register_ram_global(ram);

    memory_region_add_subregion(address_space_mem, 0x40000000, ram);

    /* Internal SRAM.  */

    memory_region_init_ram(sram, "mcf5208.sram", 16384);

    vmstate_register_ram_global(sram);

    memory_region_add_subregion(address_space_mem, 0x80000000, sram);

    /* Internal peripherals.  */

    pic = mcf_intc_init(address_space_mem, 0xfc048000, env);

    mcf_uart_mm_init(address_space_mem, 0xfc060000, pic[26], serial_hds[0]);

    mcf_uart_mm_init(address_space_mem, 0xfc064000, pic[27], serial_hds[1]);

    mcf_uart_mm_init(address_space_mem, 0xfc068000, pic[28], serial_hds[2]);

    mcf5208_sys_init(address_space_mem, pic);

    if (nb_nics > 1) {

        fprintf(stderr, "Too many NICs\n");

        exit(1);

    }

    if (nd_table[0].used)

        mcf_fec_init(address_space_mem, &nd_table[0],

                     0xfc030000, pic + 36);

    /*  0xfc000000 SCM.  */

    /*  0xfc004000 XBS.  */

    /*  0xfc008000 FlexBus CS.  */

    /* 0xfc030000 FEC.  */

    /*  0xfc040000 SCM + Power management.  */

    /*  0xfc044000 eDMA.  */

    /* 0xfc048000 INTC.  */

    /*  0xfc058000 I2C.  */

    /*  0xfc05c000 QSPI.  */

    /* 0xfc060000 UART0.  */

    /* 0xfc064000 UART0.  */

    /* 0xfc068000 UART0.  */

    /*  0xfc070000 DMA timers.  */

    /* 0xfc080000 PIT0.  */

    /* 0xfc084000 PIT1.  */

    /*  0xfc088000 EPORT.  */

    /*  0xfc08c000 Watchdog.  */

    /*  0xfc090000 clock module.  */

    /*  0xfc0a0000 CCM + reset.  */

    /*  0xfc0a4000 GPIO.  */

    /* 0xfc0a8000 SDRAM controller.  */

    /* Load kernel.  */

    if (!kernel_filename) {

        fprintf(stderr, "Kernel image must be specified\n");

        exit(1);

    }

    kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,

                           NULL, NULL, 1, ELF_MACHINE, 0);

    entry = elf_entry;

    if (kernel_size < 0) {

        kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL);

    }

    if (kernel_size < 0) {

        kernel_size = load_image_targphys(kernel_filename, 0x40000000,

                                          ram_size);

        entry = 0x40000000;

    }

    if (kernel_size < 0) {

        fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);

        exit(1);

    }

    env->pc = entry;

}

static QEMUMachine mcf5208evb_machine = {

    .name = "mcf5208evb",

    .desc = "MCF5206EVB",

    .init = mcf5208evb_init,

    .is_default = 1,

};

static void mcf5208evb_machine_init(void)

{

    qemu_register_machine(&mcf5208evb_machine);

}

machine_init(mcf5208evb_machine_init);