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/*

 * QEMU model for the AXIS devboard 88.

 *

 * Copyright (c) 2009 Edgar E. Iglesias, Axis Communications AB.

 *

 * 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 "sysbus.h"

#include "net.h"

#include "flash.h"

#include "boards.h"

#include "sysemu.h"

#include "etraxfs.h"

#include "loader.h"

#include "elf.h"

#define D(x)

#define DNAND(x)

struct nand_state_t

{

    NANDFlashState *nand;

    unsigned int rdy:1;

    unsigned int ale:1;

    unsigned int cle:1;

    unsigned int ce:1;

};

static struct nand_state_t nand_state;

static uint32_t nand_readl (void *opaque, target_phys_addr_t addr)

{

    struct nand_state_t *s = opaque;

    uint32_t r;

    int rdy;

    r = nand_getio(s->nand);

    nand_getpins(s->nand, &rdy);

    s->rdy = rdy;

    DNAND(printf("%s addr=%x r=%x\n", __func__, addr, r));

    return r;

}

static void

nand_writel (void *opaque, target_phys_addr_t addr, uint32_t value)

{

    struct nand_state_t *s = opaque;

    int rdy;

    DNAND(printf("%s addr=%x v=%x\n", __func__, addr, value));

    nand_setpins(s->nand, s->cle, s->ale, s->ce, 1, 0);

    nand_setio(s->nand, value);

    nand_getpins(s->nand, &rdy);

    s->rdy = rdy;

}

static CPUReadMemoryFunc * const nand_read[] = {

    &nand_readl,

    &nand_readl,

    &nand_readl,

};

static CPUWriteMemoryFunc * const nand_write[] = {

    &nand_writel,

    &nand_writel,

    &nand_writel,

};

struct tempsensor_t

{

    unsigned int shiftreg;

    unsigned int count;

    enum {

        ST_OUT, ST_IN, ST_Z

    } state;

    uint16_t regs[3];

};

static void tempsensor_clkedge(struct tempsensor_t *s,

                               unsigned int clk, unsigned int data_in)

{

    D(printf("%s clk=%d state=%d sr=%x\n", __func__,

             clk, s->state, s->shiftreg));

    if (s->count == 0) {

        s->count = 16;

        s->state = ST_OUT;

    }

    switch (s->state) {

        case ST_OUT:

            /* Output reg is clocked at negedge.  */

            if (!clk) {

                s->count--;

                s->shiftreg <<= 1;

                if (s->count == 0) {

                    s->shiftreg = 0;

                    s->state = ST_IN;

                    s->count = 16;

                }

            }

            break;

        case ST_Z:

            if (clk) {

                s->count--;

                if (s->count == 0) {

                    s->shiftreg = 0;

                    s->state = ST_OUT;

                    s->count = 16;

                }

            }

            break;

        case ST_IN:

            /* Indata is sampled at posedge.  */

            if (clk) {

                s->count--;

                s->shiftreg <<= 1;

                s->shiftreg |= data_in & 1;

                if (s->count == 0) {

                    D(printf("%s cfgreg=%x\n", __func__, s->shiftreg));

                    s->regs[0] = s->shiftreg;

                    s->state = ST_OUT;

                    s->count = 16;

                    if ((s->regs[0] & 0xff) == 0) {

                        /* 25 degrees celcius.  */

                        s->shiftreg = 0x0b9f;

                    } else if ((s->regs[0] & 0xff) == 0xff) {

                        /* Sensor ID, 0x8100 LM70.  */

                        s->shiftreg = 0x8100;

                    } else

                        printf("Invalid tempsens state %x\n", s->regs[0]);

                }

            }

            break;

    }

}

#define RW_PA_DOUT    0x00

#define R_PA_DIN      0x01

#define RW_PA_OE      0x02

#define RW_PD_DOUT    0x10

#define R_PD_DIN      0x11

#define RW_PD_OE      0x12

static struct gpio_state_t

{

    struct nand_state_t *nand;

    struct tempsensor_t tempsensor;

    uint32_t regs[0x5c / 4];

} gpio_state;

static uint32_t gpio_readl (void *opaque, target_phys_addr_t addr)

{

    struct gpio_state_t *s = opaque;

    uint32_t r = 0;

    addr >>= 2;

    switch (addr)

    {

        case R_PA_DIN:

            r = s->regs[RW_PA_DOUT] & s->regs[RW_PA_OE];

            /* Encode pins from the nand.  */

            r |= s->nand->rdy << 7;

            break;

        case R_PD_DIN:

            r = s->regs[RW_PD_DOUT] & s->regs[RW_PD_OE];

            /* Encode temp sensor pins.  */

            r |= (!!(s->tempsensor.shiftreg & 0x10000)) << 4;

            break;

        default:

            r = s->regs[addr];

            break;

    }

    return r;

    D(printf("%s %x=%x\n", __func__, addr, r));

}

static void gpio_writel (void *opaque, target_phys_addr_t addr, uint32_t value)

{

    struct gpio_state_t *s = opaque;

    D(printf("%s %x=%x\n", __func__, addr, value));

    addr >>= 2;

    switch (addr)

    {

        case RW_PA_DOUT:

            /* Decode nand pins.  */

            s->nand->ale = !!(value & (1 << 6));

            s->nand->cle = !!(value & (1 << 5));

            s->nand->ce  = !!(value & (1 << 4));

            s->regs[addr] = value;

            break;

        case RW_PD_DOUT:

            /* Temp sensor clk.  */

            if ((s->regs[addr] ^ value) & 2)

                tempsensor_clkedge(&s->tempsensor, !!(value & 2),

                                   !!(value & 16));

            s->regs[addr] = value;

            break;

        default:

            s->regs[addr] = value;

            break;

    }

}

static CPUReadMemoryFunc * const gpio_read[] = {

    NULL, NULL,

    &gpio_readl,

};

static CPUWriteMemoryFunc * const gpio_write[] = {

    NULL, NULL,

    &gpio_writel,

};

#define INTMEM_SIZE (128 * 1024)

static uint32_t bootstrap_pc;

static void main_cpu_reset(void *opaque)

{

    CPUState *env = opaque;

    cpu_reset(env);

    env->pc = bootstrap_pc;

}

static

void axisdev88_init (ram_addr_t ram_size,

                     const char *boot_device,

                     const char *kernel_filename, const char *kernel_cmdline,

                     const char *initrd_filename, const char *cpu_model)

{

    CPUState *env;

    DeviceState *dev;

    SysBusDevice *s;

    qemu_irq irq[30], nmi[2], *cpu_irq;

    void *etraxfs_dmac;

    struct etraxfs_dma_client *eth[2] = {NULL, NULL};

    int kernel_size;

    int i;

    int nand_regs;

    int gpio_regs;

    ram_addr_t phys_ram;

    ram_addr_t phys_intmem;

    /* init CPUs */

    if (cpu_model == NULL) {

        cpu_model = "crisv32";

    }

    env = cpu_init(cpu_model);

    qemu_register_reset(main_cpu_reset, env);

    /* allocate RAM */

    phys_ram = qemu_ram_alloc(ram_size);

    cpu_register_physical_memory(0x40000000, ram_size, phys_ram | IO_MEM_RAM);

    /* The ETRAX-FS has 128Kb on chip ram, the docs refer to it as the 

       internal memory.  */

    phys_intmem = qemu_ram_alloc(INTMEM_SIZE);

    cpu_register_physical_memory(0x38000000, INTMEM_SIZE,

                                 phys_intmem | IO_MEM_RAM);

      /* Attach a NAND flash to CS1.  */

    nand_state.nand = nand_init(NAND_MFR_STMICRO, 0x39);

    nand_regs = cpu_register_io_memory(nand_read, nand_write, &nand_state);

    cpu_register_physical_memory(0x10000000, 0x05000000, nand_regs);

    gpio_state.nand = &nand_state;

    gpio_regs = cpu_register_io_memory(gpio_read, gpio_write, &gpio_state);

    cpu_register_physical_memory(0x3001a000, 0x5c, gpio_regs);

    cpu_irq = cris_pic_init_cpu(env);

    dev = qdev_create(NULL, "etraxfs,pic");

    /* FIXME: Is there a proper way to signal vectors to the CPU core?  */

    qdev_prop_set_ptr(dev, "interrupt_vector", &env->interrupt_vector);

    qdev_init(dev);

    s = sysbus_from_qdev(dev);

    sysbus_mmio_map(s, 0, 0x3001c000);

    sysbus_connect_irq(s, 0, cpu_irq[0]);

    sysbus_connect_irq(s, 1, cpu_irq[1]);

    for (i = 0; i < 30; i++) {

        irq[i] = qdev_get_gpio_in(dev, i);

    }

    nmi[0] = qdev_get_gpio_in(dev, 30);

    nmi[1] = qdev_get_gpio_in(dev, 31);

    etraxfs_dmac = etraxfs_dmac_init(0x30000000, 10);

    for (i = 0; i < 10; i++) {

        /* On ETRAX, odd numbered channels are inputs.  */

        etraxfs_dmac_connect(etraxfs_dmac, i, irq + 7 + i, i & 1);

    }

    /* Add the two ethernet blocks.  */

    eth[0] = etraxfs_eth_init(&nd_table[0], 0x30034000, 1);

    if (nb_nics > 1)

        eth[1] = etraxfs_eth_init(&nd_table[1], 0x30036000, 2);

    /* The DMA Connector block is missing, hardwire things for now.  */

    etraxfs_dmac_connect_client(etraxfs_dmac, 0, eth[0]);

    etraxfs_dmac_connect_client(etraxfs_dmac, 1, eth[0] + 1);

    if (eth[1]) {

        etraxfs_dmac_connect_client(etraxfs_dmac, 6, eth[1]);

        etraxfs_dmac_connect_client(etraxfs_dmac, 7, eth[1] + 1);

    }

    /* 2 timers.  */

    sysbus_create_varargs("etraxfs,timer", 0x3001e000, irq[0x1b], nmi[1], NULL);

    sysbus_create_varargs("etraxfs,timer", 0x3005e000, irq[0x1b], nmi[1], NULL);

    for (i = 0; i < 4; i++) {

        sysbus_create_simple("etraxfs,serial", 0x30026000 + i * 0x2000,

                             irq[0x14 + i]);

    }

    if (kernel_filename) {

        uint64_t entry, high;

        int kcmdline_len;

        /* Boots a kernel elf binary, os/linux-2.6/vmlinux from the axis 

           devboard SDK.  */

        kernel_size = load_elf(kernel_filename, -0x80000000LL,

                               &entry, NULL, &high, 0, ELF_MACHINE, 0);

        bootstrap_pc = entry;

        if (kernel_size < 0) {

            /* Takes a kimage from the axis devboard SDK.  */

            kernel_size = load_image_targphys(kernel_filename, 0x40004000,

                                              ram_size);

            bootstrap_pc = 0x40004000;

            env->regs[9] = 0x40004000 + kernel_size;

        }

        env->regs[8] = 0x56902387; /* RAM init magic.  */

        if (kernel_cmdline && (kcmdline_len = strlen(kernel_cmdline))) {

            if (kcmdline_len > 256) {

                fprintf(stderr, "Too long CRIS kernel cmdline (max 256)\n");

                exit(1);

            }

            /* Let the kernel know we are modifying the cmdline.  */

            env->regs[10] = 0x87109563;

            env->regs[11] = 0x40000000;

            pstrcpy_targphys(env->regs[11], 256, kernel_cmdline);

        }

    }

    env->pc = bootstrap_pc;

    printf ("pc =%x\n", env->pc);

    printf ("ram size =%ld\n", ram_size);

}

static QEMUMachine axisdev88_machine = {

    .name = "axis-dev88",

    .desc = "AXIS devboard 88",

    .init = axisdev88_init,

};

static void axisdev88_machine_init(void)

{

    qemu_register_machine(&axisdev88_machine);

}

machine_init(axisdev88_machine_init);