Archipelago » qemu

/*

 * TI OMAP processors UART emulation.

 *

 * Copyright (C) 2006-2008 Andrzej Zaborowski  <balrog@zabor.org>

 * Copyright (C) 2007-2009 Nokia Corporation

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 or

 * (at your option) version 3 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, see <http://www.gnu.org/licenses/>.

 */

#include "char/char.h"

#include "hw/hw.h"

#include "hw/arm/omap.h"

#include "hw/char/serial.h"

#include "exec/address-spaces.h"

/* UARTs */

struct omap_uart_s {

    MemoryRegion iomem;

    hwaddr base;

    SerialState *serial; /* TODO */

    struct omap_target_agent_s *ta;

    omap_clk fclk;

    qemu_irq irq;

    uint8_t eblr;

    uint8_t syscontrol;

    uint8_t wkup;

    uint8_t cfps;

    uint8_t mdr[2];

    uint8_t scr;

    uint8_t clksel;

};

void omap_uart_reset(struct omap_uart_s *s)

{

    s->eblr = 0x00;

    s->syscontrol = 0;

    s->wkup = 0x3f;

    s->cfps = 0x69;

    s->clksel = 0;

}

struct omap_uart_s *omap_uart_init(hwaddr base,

                qemu_irq irq, omap_clk fclk, omap_clk iclk,

                qemu_irq txdma, qemu_irq rxdma,

                const char *label, CharDriverState *chr)

{

    struct omap_uart_s *s = (struct omap_uart_s *)

            g_malloc0(sizeof(struct omap_uart_s));

    s->base = base;

    s->fclk = fclk;

    s->irq = irq;

    s->serial = serial_mm_init(get_system_memory(), base, 2, irq,

                               omap_clk_getrate(fclk)/16,

                               chr ?: qemu_chr_new(label, "null", NULL),

                               DEVICE_NATIVE_ENDIAN);

    return s;

}

static uint64_t omap_uart_read(void *opaque, hwaddr addr,

                               unsigned size)

{

    struct omap_uart_s *s = (struct omap_uart_s *) opaque;

    if (size == 4) {

        return omap_badwidth_read8(opaque, addr);

    }

    switch (addr) {

    case 0x20:        /* MDR1 */

        return s->mdr[0];

    case 0x24:        /* MDR2 */

        return s->mdr[1];

    case 0x40:        /* SCR */

        return s->scr;

    case 0x44:        /* SSR */

        return 0x0;

    case 0x48:        /* EBLR (OMAP2) */

        return s->eblr;

    case 0x4C:        /* OSC_12M_SEL (OMAP1) */

        return s->clksel;

    case 0x50:        /* MVR */

        return 0x30;

    case 0x54:        /* SYSC (OMAP2) */

        return s->syscontrol;

    case 0x58:        /* SYSS (OMAP2) */

        return 1;

    case 0x5c:        /* WER (OMAP2) */

        return s->wkup;

    case 0x60:        /* CFPS (OMAP2) */

        return s->cfps;

    }

    OMAP_BAD_REG(addr);

    return 0;

}

static void omap_uart_write(void *opaque, hwaddr addr,

                            uint64_t value, unsigned size)

{

    struct omap_uart_s *s = (struct omap_uart_s *) opaque;

    if (size == 4) {

        return omap_badwidth_write8(opaque, addr, value);

    }

    switch (addr) {

    case 0x20:        /* MDR1 */

        s->mdr[0] = value & 0x7f;

        break;

    case 0x24:        /* MDR2 */

        s->mdr[1] = value & 0xff;

        break;

    case 0x40:        /* SCR */

        s->scr = value & 0xff;

        break;

    case 0x48:        /* EBLR (OMAP2) */

        s->eblr = value & 0xff;

        break;

    case 0x4C:        /* OSC_12M_SEL (OMAP1) */

        s->clksel = value & 1;

        break;

    case 0x44:        /* SSR */

    case 0x50:        /* MVR */

    case 0x58:        /* SYSS (OMAP2) */

        OMAP_RO_REG(addr);

        break;

    case 0x54:        /* SYSC (OMAP2) */

        s->syscontrol = value & 0x1d;

        if (value & 2)

            omap_uart_reset(s);

        break;

    case 0x5c:        /* WER (OMAP2) */

        s->wkup = value & 0x7f;

        break;

    case 0x60:        /* CFPS (OMAP2) */

        s->cfps = value & 0xff;

        break;

    default:

        OMAP_BAD_REG(addr);

    }

}

static const MemoryRegionOps omap_uart_ops = {

    .read = omap_uart_read,

    .write = omap_uart_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

struct omap_uart_s *omap2_uart_init(MemoryRegion *sysmem,

                struct omap_target_agent_s *ta,

                qemu_irq irq, omap_clk fclk, omap_clk iclk,

                qemu_irq txdma, qemu_irq rxdma,

                const char *label, CharDriverState *chr)

{

    hwaddr base = omap_l4_attach(ta, 0, NULL);

    struct omap_uart_s *s = omap_uart_init(base, irq,

                    fclk, iclk, txdma, rxdma, label, chr);

    memory_region_init_io(&s->iomem, &omap_uart_ops, s, "omap.uart", 0x100);

    s->ta = ta;

    memory_region_add_subregion(sysmem, base + 0x20, &s->iomem);

    return s;

}

void omap_uart_attach(struct omap_uart_s *s, CharDriverState *chr)

{

    /* TODO: Should reuse or destroy current s->serial */

    s->serial = serial_mm_init(get_system_memory(), s->base, 2, s->irq,

                               omap_clk_getrate(s->fclk) / 16,

                               chr ?: qemu_chr_new("null", "null", NULL),

                               DEVICE_NATIVE_ENDIAN);

}