Archipelago » qemu

/*

 * TI OMAP DMA gigacell.

 *

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

 * Copyright (C) 2007-2008 Lauro Ramos Venancio  <lauro.venancio@indt.org.br>

 *

 * 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 of

 * the License, or (at your option) any later version.

 *

 * 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,

 * MA 02111-1307 USA

 */

#include "qemu-common.h"

#include "qemu-timer.h"

#include "omap.h"

#include "irq.h"

struct omap_dma_channel_s {

    /* transfer data */

    int burst[2];

    int pack[2];

    int endian[2];

    int endian_lock[2];

    int translate[2];

    enum omap_dma_port port[2];

    target_phys_addr_t addr[2];

    omap_dma_addressing_t mode[2];

    uint32_t elements;

    uint16_t frames;

    int32_t frame_index[2];

    int16_t element_index[2];

    int data_type;

    /* transfer type */

    int transparent_copy;

    int constant_fill;

    uint32_t color;

    int prefetch;

    /* auto init and linked channel data */

    int end_prog;

    int repeat;

    int auto_init;

    int link_enabled;

    int link_next_ch;

    /* interruption data */

    int interrupts;

    int status;

    int cstatus;

    /* state data */

    int active;

    int enable;

    int sync;

    int src_sync;

    int pending_request;

    int waiting_end_prog;

    uint16_t cpc;

    /* sync type */

    int fs;

    int bs;

    /* compatibility */

    int omap_3_1_compatible_disable;

    qemu_irq irq;

    struct omap_dma_channel_s *sibling;

    struct omap_dma_reg_set_s {

        target_phys_addr_t src, dest;

        int frame;

        int element;

        int pck_element;

        int frame_delta[2];

        int elem_delta[2];

        int frames;

        int elements;

        int pck_elements;

    } active_set;

    /* unused parameters */

    int write_mode;

    int priority;

    int interleave_disabled;

    int type;

    int suspend;

    int buf_disable;

};

struct omap_dma_s {

    QEMUTimer *tm;

    struct omap_mpu_state_s *mpu;

    target_phys_addr_t base;

    omap_clk clk;

    int64_t delay;

    uint64_t drq;

    qemu_irq irq[4];

    void (*intr_update)(struct omap_dma_s *s);

    enum omap_dma_model model;

    int omap_3_1_mapping_disabled;

    uint32_t gcr;

    uint32_t ocp;

    uint32_t caps[5];

    uint32_t irqen[4];

    uint32_t irqstat[4];

    int run_count;

    int chans;

    struct omap_dma_channel_s ch[32];

    struct omap_dma_lcd_channel_s lcd_ch;

};

/* Interrupts */

#define TIMEOUT_INTR    (1 << 0)

#define EVENT_DROP_INTR (1 << 1)

#define HALF_FRAME_INTR (1 << 2)

#define END_FRAME_INTR  (1 << 3)

#define LAST_FRAME_INTR (1 << 4)

#define END_BLOCK_INTR  (1 << 5)

#define SYNC            (1 << 6)

#define END_PKT_INTR        (1 << 7)

#define TRANS_ERR_INTR        (1 << 8)

#define MISALIGN_INTR        (1 << 11)

static inline void omap_dma_interrupts_update(struct omap_dma_s *s)

{

    return s->intr_update(s);

}

static void omap_dma_channel_load(struct omap_dma_s *s,

                struct omap_dma_channel_s *ch)

{

    struct omap_dma_reg_set_s *a = &ch->active_set;

    int i;

    int omap_3_1 = !ch->omap_3_1_compatible_disable;

    /*

     * TODO: verify address ranges and alignment

     * TODO: port endianness

     */

    a->src = ch->addr[0];

    a->dest = ch->addr[1];

    a->frames = ch->frames;

    a->elements = ch->elements;

    a->pck_elements = ch->frame_index[!ch->src_sync];

    a->frame = 0;

    a->element = 0;

    a->pck_element = 0;

    if (unlikely(!ch->elements || !ch->frames)) {

        printf("%s: bad DMA request\n", __FUNCTION__);

        return;

    }

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

        switch (ch->mode[i]) {

        case constant:

            a->elem_delta[i] = 0;

            a->frame_delta[i] = 0;

            break;

        case post_incremented:

            a->elem_delta[i] = ch->data_type;

            a->frame_delta[i] = 0;

            break;

        case single_index:

            a->elem_delta[i] = ch->data_type +

                    ch->element_index[omap_3_1 ? 0 : i] - 1;

            a->frame_delta[i] = 0;

            break;

        case double_index:

            a->elem_delta[i] = ch->data_type +

                    ch->element_index[omap_3_1 ? 0 : i] - 1;

            a->frame_delta[i] = ch->frame_index[omap_3_1 ? 0 : i] -

                    ch->element_index[omap_3_1 ? 0 : i];

            break;

        default:

            break;

        }

}

static void omap_dma_activate_channel(struct omap_dma_s *s,

                struct omap_dma_channel_s *ch)

{

    if (!ch->active) {

        ch->active = 1;

        if (ch->sync)

            ch->status |= SYNC;

        s->run_count ++;

    }

    if (s->delay && !qemu_timer_pending(s->tm))

        qemu_mod_timer(s->tm, qemu_get_clock(vm_clock) + s->delay);

}

static void omap_dma_deactivate_channel(struct omap_dma_s *s,

                struct omap_dma_channel_s *ch)

{

    /* Update cpc */

    ch->cpc = ch->active_set.dest & 0xffff;

    if (ch->pending_request && !ch->waiting_end_prog && ch->enable) {

        /* Don't deactivate the channel */

        ch->pending_request = 0;

        return;

    }

    /* Don't deactive the channel if it is synchronized and the DMA request is

       active */

    if (ch->sync && ch->enable && (s->drq & (1 << ch->sync)))

        return;

    if (ch->active) {

        ch->active = 0;

        ch->status &= ~SYNC;

        s->run_count --;

    }

    if (!s->run_count)

        qemu_del_timer(s->tm);

}

static void omap_dma_enable_channel(struct omap_dma_s *s,

                struct omap_dma_channel_s *ch)

{

    if (!ch->enable) {

        ch->enable = 1;

        ch->waiting_end_prog = 0;

        omap_dma_channel_load(s, ch);

        /* TODO: theoretically if ch->sync && ch->prefetch &&

         * !s->drq[ch->sync], we should also activate and fetch from source

         * and then stall until signalled.  */

        if ((!ch->sync) || (s->drq & (1 << ch->sync)))

            omap_dma_activate_channel(s, ch);

    }

}

static void omap_dma_disable_channel(struct omap_dma_s *s,

                struct omap_dma_channel_s *ch)

{

    if (ch->enable) {

        ch->enable = 0;

        /* Discard any pending request */

        ch->pending_request = 0;

        omap_dma_deactivate_channel(s, ch);

    }

}

static void omap_dma_channel_end_prog(struct omap_dma_s *s,

                struct omap_dma_channel_s *ch)

{

    if (ch->waiting_end_prog) {

        ch->waiting_end_prog = 0;

        if (!ch->sync || ch->pending_request) {

            ch->pending_request = 0;

            omap_dma_activate_channel(s, ch);

        }

    }

}

static void omap_dma_interrupts_3_1_update(struct omap_dma_s *s)

{

    struct omap_dma_channel_s *ch = s->ch;

    /* First three interrupts are shared between two channels each. */

    if (ch[0].status | ch[6].status)

        qemu_irq_raise(ch[0].irq);

    if (ch[1].status | ch[7].status)

        qemu_irq_raise(ch[1].irq);

    if (ch[2].status | ch[8].status)

        qemu_irq_raise(ch[2].irq);

    if (ch[3].status)

        qemu_irq_raise(ch[3].irq);

    if (ch[4].status)

        qemu_irq_raise(ch[4].irq);

    if (ch[5].status)

        qemu_irq_raise(ch[5].irq);

}

static void omap_dma_interrupts_3_2_update(struct omap_dma_s *s)

{

    struct omap_dma_channel_s *ch = s->ch;

    int i;

    for (i = s->chans; i; ch ++, i --)

        if (ch->status)

            qemu_irq_raise(ch->irq);

}

static void omap_dma_enable_3_1_mapping(struct omap_dma_s *s)

{

    s->omap_3_1_mapping_disabled = 0;

    s->chans = 9;

    s->intr_update = omap_dma_interrupts_3_1_update;

}

static void omap_dma_disable_3_1_mapping(struct omap_dma_s *s)

{

    s->omap_3_1_mapping_disabled = 1;

    s->chans = 16;

    s->intr_update = omap_dma_interrupts_3_2_update;

}

static void omap_dma_process_request(struct omap_dma_s *s, int request)

{

    int channel;

    int drop_event = 0;

    struct omap_dma_channel_s *ch = s->ch;

    for (channel = 0; channel < s->chans; channel ++, ch ++) {

        if (ch->enable && ch->sync == request) {

            if (!ch->active)

                omap_dma_activate_channel(s, ch);

            else if (!ch->pending_request)

                ch->pending_request = 1;

            else {

                /* Request collision */

                /* Second request received while processing other request */

                ch->status |= EVENT_DROP_INTR;

                drop_event = 1;

            }

        }

    }

    if (drop_event)

        omap_dma_interrupts_update(s);

}

static void omap_dma_channel_run(struct omap_dma_s *s)

{

    int n = s->chans;

    uint16_t status;

    uint8_t value[4];

    struct omap_dma_port_if_s *src_p, *dest_p;

    struct omap_dma_reg_set_s *a;

    struct omap_dma_channel_s *ch;

    for (ch = s->ch; n; n --, ch ++) {

        if (!ch->active)

            continue;

        a = &ch->active_set;

        src_p = &s->mpu->port[ch->port[0]];

        dest_p = &s->mpu->port[ch->port[1]];

        if ((!ch->constant_fill && !src_p->addr_valid(s->mpu, a->src)) ||

                        (!dest_p->addr_valid(s->mpu, a->dest))) {

#if 0

            /* Bus time-out */

            if (ch->interrupts & TIMEOUT_INTR)

                ch->status |= TIMEOUT_INTR;

            omap_dma_deactivate_channel(s, ch);

            continue;

#endif

            printf("%s: Bus time-out in DMA%i operation\n",

                            __FUNCTION__, s->chans - n);

        }

        status = ch->status;

        while (status == ch->status && ch->active) {

            /* Transfer a single element */

            /* FIXME: check the endianness */

            if (!ch->constant_fill)

                cpu_physical_memory_read(a->src, value, ch->data_type);

            else

                *(uint32_t *) value = ch->color;

            if (!ch->transparent_copy ||

                    *(uint32_t *) value != ch->color)

                cpu_physical_memory_write(a->dest, value, ch->data_type);

            a->src += a->elem_delta[0];

            a->dest += a->elem_delta[1];

            a->element ++;

            /* If the channel is element synchronized, deactivate it */

            if (ch->sync && !ch->fs && !ch->bs)

                omap_dma_deactivate_channel(s, ch);

            /* If it is the last frame, set the LAST_FRAME interrupt */

            if (a->element == 1 && a->frame == a->frames - 1)

                if (ch->interrupts & LAST_FRAME_INTR)

                    ch->status |= LAST_FRAME_INTR;

            /* If the half of the frame was reached, set the HALF_FRAME

               interrupt */

            if (a->element == (a->elements >> 1))

                if (ch->interrupts & HALF_FRAME_INTR)

                    ch->status |= HALF_FRAME_INTR;

            if (ch->fs && ch->bs) {

                a->pck_element ++;

                /* Check if a full packet has beed transferred.  */

                if (a->pck_element == a->pck_elements) {

                    a->pck_element = 0;

                    /* Set the END_PKT interrupt */

                    if ((ch->interrupts & END_PKT_INTR) && !ch->src_sync)

                        ch->status |= END_PKT_INTR;

                    /* If the channel is packet-synchronized, deactivate it */

                    if (ch->sync)

                        omap_dma_deactivate_channel(s, ch);

                }

            }

            if (a->element == a->elements) {

                /* End of Frame */

                a->element = 0;

                a->src += a->frame_delta[0];

                a->dest += a->frame_delta[1];

                a->frame ++;

                /* If the channel is frame synchronized, deactivate it */

                if (ch->sync && ch->fs && !ch->bs)

                    omap_dma_deactivate_channel(s, ch);

                /* If the channel is async, update cpc */

                if (!ch->sync)

                    ch->cpc = a->dest & 0xffff;

                /* Set the END_FRAME interrupt */

                if (ch->interrupts & END_FRAME_INTR)

                    ch->status |= END_FRAME_INTR;

                if (a->frame == a->frames) {

                    /* End of Block */

                    /* Disable the channel */

                    if (ch->omap_3_1_compatible_disable) {

                        omap_dma_disable_channel(s, ch);

                        if (ch->link_enabled)

                            omap_dma_enable_channel(s,

                                            &s->ch[ch->link_next_ch]);

                    } else {

                        if (!ch->auto_init)

                            omap_dma_disable_channel(s, ch);

                        else if (ch->repeat || ch->end_prog)

                            omap_dma_channel_load(s, ch);

                        else {

                            ch->waiting_end_prog = 1;

                            omap_dma_deactivate_channel(s, ch);

                        }

                    }

                    if (ch->interrupts & END_BLOCK_INTR)

                        ch->status |= END_BLOCK_INTR;

                }

            }

        }

    }

    omap_dma_interrupts_update(s);

    if (s->run_count && s->delay)

        qemu_mod_timer(s->tm, qemu_get_clock(vm_clock) + s->delay);

}

void omap_dma_reset(struct omap_dma_s *s)

{

    int i;

    qemu_del_timer(s->tm);

    if (s->model < omap_dma_4)

        s->gcr = 0x0004;

    else

        s->gcr = 0x00010010;

    s->ocp = 0x00000000;

    memset(&s->irqstat, 0, sizeof(s->irqstat));

    memset(&s->irqen, 0, sizeof(s->irqen));

    s->drq = 0x00000000;

    s->run_count = 0;

    s->lcd_ch.src = emiff;

    s->lcd_ch.condition = 0;

    s->lcd_ch.interrupts = 0;

    s->lcd_ch.dual = 0;

    if (s->model < omap_dma_4)

        omap_dma_enable_3_1_mapping(s);

    for (i = 0; i < s->chans; i ++) {

        s->ch[i].suspend = 0;

        s->ch[i].prefetch = 0;

        s->ch[i].buf_disable = 0;

        s->ch[i].src_sync = 0;

        memset(&s->ch[i].burst, 0, sizeof(s->ch[i].burst));

        memset(&s->ch[i].port, 0, sizeof(s->ch[i].port));

        memset(&s->ch[i].mode, 0, sizeof(s->ch[i].mode));

        memset(&s->ch[i].frame_index, 0, sizeof(s->ch[i].frame_index));

        memset(&s->ch[i].element_index, 0, sizeof(s->ch[i].element_index));

        memset(&s->ch[i].endian, 0, sizeof(s->ch[i].endian));

        memset(&s->ch[i].endian_lock, 0, sizeof(s->ch[i].endian_lock));

        memset(&s->ch[i].translate, 0, sizeof(s->ch[i].translate));

        s->ch[i].write_mode = 0;

        s->ch[i].data_type = 0;

        s->ch[i].transparent_copy = 0;

        s->ch[i].constant_fill = 0;

        s->ch[i].color = 0x00000000;

        s->ch[i].end_prog = 0;

        s->ch[i].repeat = 0;

        s->ch[i].auto_init = 0;

        s->ch[i].link_enabled = 0;

        if (s->model < omap_dma_4)

            s->ch[i].interrupts = 0x0003;

        else

            s->ch[i].interrupts = 0x0000;

        s->ch[i].status = 0;

        s->ch[i].cstatus = 0;

        s->ch[i].active = 0;

        s->ch[i].enable = 0;

        s->ch[i].sync = 0;

        s->ch[i].pending_request = 0;

        s->ch[i].waiting_end_prog = 0;

        s->ch[i].cpc = 0x0000;

        s->ch[i].fs = 0;

        s->ch[i].bs = 0;

        s->ch[i].omap_3_1_compatible_disable = 0;

        memset(&s->ch[i].active_set, 0, sizeof(s->ch[i].active_set));

        s->ch[i].priority = 0;

        s->ch[i].interleave_disabled = 0;

        s->ch[i].type = 0;

    }

}

static int omap_dma_ch_reg_read(struct omap_dma_s *s,

                struct omap_dma_channel_s *ch, int reg, uint16_t *value)

{

    switch (reg) {

    case 0x00:        /* SYS_DMA_CSDP_CH0 */

        *value = (ch->burst[1] << 14) |

                (ch->pack[1] << 13) |

                (ch->port[1] << 9) |

                (ch->burst[0] << 7) |

                (ch->pack[0] << 6) |

                (ch->port[0] << 2) |

                (ch->data_type >> 1);

        break;

    case 0x02:        /* SYS_DMA_CCR_CH0 */

        if (s->model <= omap_dma_3_1)

            *value = 0 << 10;                        /* FIFO_FLUSH reads as 0 */

        else

            *value = ch->omap_3_1_compatible_disable << 10;

        *value |= (ch->mode[1] << 14) |

                (ch->mode[0] << 12) |

                (ch->end_prog << 11) |

                (ch->repeat << 9) |

                (ch->auto_init << 8) |

                (ch->enable << 7) |

                (ch->priority << 6) |

                (ch->fs << 5) | ch->sync;

        break;

    case 0x04:        /* SYS_DMA_CICR_CH0 */

        *value = ch->interrupts;

        break;

    case 0x06:        /* SYS_DMA_CSR_CH0 */

        *value = ch->status;

        ch->status &= SYNC;

        if (!ch->omap_3_1_compatible_disable && ch->sibling) {

            *value |= (ch->sibling->status & 0x3f) << 6;

            ch->sibling->status &= SYNC;

        }

        qemu_irq_lower(ch->irq);

        break;

    case 0x08:        /* SYS_DMA_CSSA_L_CH0 */

        *value = ch->addr[0] & 0x0000ffff;

        break;

    case 0x0a:        /* SYS_DMA_CSSA_U_CH0 */

        *value = ch->addr[0] >> 16;

        break;

    case 0x0c:        /* SYS_DMA_CDSA_L_CH0 */

        *value = ch->addr[1] & 0x0000ffff;

        break;

    case 0x0e:        /* SYS_DMA_CDSA_U_CH0 */

        *value = ch->addr[1] >> 16;

        break;

    case 0x10:        /* SYS_DMA_CEN_CH0 */

        *value = ch->elements;

        break;

    case 0x12:        /* SYS_DMA_CFN_CH0 */

        *value = ch->frames;

        break;

    case 0x14:        /* SYS_DMA_CFI_CH0 */

        *value = ch->frame_index[0];

        break;

    case 0x16:        /* SYS_DMA_CEI_CH0 */

        *value = ch->element_index[0];

        break;

    case 0x18:        /* SYS_DMA_CPC_CH0 or DMA_CSAC */

        if (ch->omap_3_1_compatible_disable)

            *value = ch->active_set.src & 0xffff;        /* CSAC */

        else

            *value = ch->cpc;

        break;

    case 0x1a:        /* DMA_CDAC */

        *value = ch->active_set.dest & 0xffff;        /* CDAC */

        break;

    case 0x1c:        /* DMA_CDEI */

        *value = ch->element_index[1];

        break;

    case 0x1e:        /* DMA_CDFI */

        *value = ch->frame_index[1];

        break;

    case 0x20:        /* DMA_COLOR_L */

        *value = ch->color & 0xffff;

        break;

    case 0x22:        /* DMA_COLOR_U */

        *value = ch->color >> 16;

        break;

    case 0x24:        /* DMA_CCR2 */

        *value = (ch->bs << 2) |

                (ch->transparent_copy << 1) |

                ch->constant_fill;

        break;

    case 0x28:        /* DMA_CLNK_CTRL */

        *value = (ch->link_enabled << 15) |

                (ch->link_next_ch & 0xf);

        break;

    case 0x2a:        /* DMA_LCH_CTRL */

        *value = (ch->interleave_disabled << 15) |

                ch->type;

        break;

    default:

        return 1;

    }

    return 0;

}

static int omap_dma_ch_reg_write(struct omap_dma_s *s,

                struct omap_dma_channel_s *ch, int reg, uint16_t value)

{

    switch (reg) {

    case 0x00:        /* SYS_DMA_CSDP_CH0 */

        ch->burst[1] = (value & 0xc000) >> 14;

        ch->pack[1] = (value & 0x2000) >> 13;

        ch->port[1] = (enum omap_dma_port) ((value & 0x1e00) >> 9);

        ch->burst[0] = (value & 0x0180) >> 7;

        ch->pack[0] = (value & 0x0040) >> 6;

        ch->port[0] = (enum omap_dma_port) ((value & 0x003c) >> 2);

        ch->data_type = 1 << (value & 3);

        if (ch->port[0] >= __omap_dma_port_last)

            printf("%s: invalid DMA port %i\n", __FUNCTION__,

                            ch->port[0]);

        if (ch->port[1] >= __omap_dma_port_last)

            printf("%s: invalid DMA port %i\n", __FUNCTION__,

                            ch->port[1]);

        if ((value & 3) == 3)

            printf("%s: bad data_type for DMA channel\n", __FUNCTION__);

        break;

    case 0x02:        /* SYS_DMA_CCR_CH0 */

        ch->mode[1] = (omap_dma_addressing_t) ((value & 0xc000) >> 14);

        ch->mode[0] = (omap_dma_addressing_t) ((value & 0x3000) >> 12);

        ch->end_prog = (value & 0x0800) >> 11;

        if (s->model >= omap_dma_3_2)

            ch->omap_3_1_compatible_disable  = (value >> 10) & 0x1;

        ch->repeat = (value & 0x0200) >> 9;

        ch->auto_init = (value & 0x0100) >> 8;

        ch->priority = (value & 0x0040) >> 6;

        ch->fs = (value & 0x0020) >> 5;

        ch->sync = value & 0x001f;

        if (value & 0x0080)

            omap_dma_enable_channel(s, ch);

        else

            omap_dma_disable_channel(s, ch);

        if (ch->end_prog)

            omap_dma_channel_end_prog(s, ch);

        break;

    case 0x04:        /* SYS_DMA_CICR_CH0 */

        ch->interrupts = value & 0x3f;

        break;

    case 0x06:        /* SYS_DMA_CSR_CH0 */

        OMAP_RO_REG((target_phys_addr_t) reg);

        break;

    case 0x08:        /* SYS_DMA_CSSA_L_CH0 */

        ch->addr[0] &= 0xffff0000;

        ch->addr[0] |= value;

        break;

    case 0x0a:        /* SYS_DMA_CSSA_U_CH0 */

        ch->addr[0] &= 0x0000ffff;

        ch->addr[0] |= (uint32_t) value << 16;

        break;

    case 0x0c:        /* SYS_DMA_CDSA_L_CH0 */

        ch->addr[1] &= 0xffff0000;

        ch->addr[1] |= value;

        break;

    case 0x0e:        /* SYS_DMA_CDSA_U_CH0 */

        ch->addr[1] &= 0x0000ffff;

        ch->addr[1] |= (uint32_t) value << 16;

        break;

    case 0x10:        /* SYS_DMA_CEN_CH0 */

        ch->elements = value;

        break;

    case 0x12:        /* SYS_DMA_CFN_CH0 */

        ch->frames = value;

        break;

    case 0x14:        /* SYS_DMA_CFI_CH0 */

        ch->frame_index[0] = (int16_t) value;

        break;

    case 0x16:        /* SYS_DMA_CEI_CH0 */

        ch->element_index[0] = (int16_t) value;

        break;

    case 0x18:        /* SYS_DMA_CPC_CH0 or DMA_CSAC */

        OMAP_RO_REG((target_phys_addr_t) reg);

        break;

    case 0x1c:        /* DMA_CDEI */

        ch->element_index[1] = (int16_t) value;

        break;

    case 0x1e:        /* DMA_CDFI */

        ch->frame_index[1] = (int16_t) value;

        break;

    case 0x20:        /* DMA_COLOR_L */

        ch->color &= 0xffff0000;

        ch->color |= value;

        break;

    case 0x22:        /* DMA_COLOR_U */

        ch->color &= 0xffff;

        ch->color |= value << 16;

        break;

    case 0x24:        /* DMA_CCR2 */

        ch->bs = (value >> 2) & 0x1;

        ch->transparent_copy = (value >> 1) & 0x1;

        ch->constant_fill = value & 0x1;

        break;

    case 0x28:        /* DMA_CLNK_CTRL */

        ch->link_enabled = (value >> 15) & 0x1;

        if (value & (1 << 14)) {                        /* Stop_Lnk */

            ch->link_enabled = 0;

            omap_dma_disable_channel(s, ch);

        }

        ch->link_next_ch = value & 0x1f;

        break;

    case 0x2a:        /* DMA_LCH_CTRL */

        ch->interleave_disabled = (value >> 15) & 0x1;

        ch->type = value & 0xf;

        break;

    default:

        return 1;

    }

    return 0;

}

static int omap_dma_3_2_lcd_write(struct omap_dma_lcd_channel_s *s, int offset,

                uint16_t value)

{

    switch (offset) {

    case 0xbc0:        /* DMA_LCD_CSDP */

        s->brust_f2 = (value >> 14) & 0x3;

        s->pack_f2 = (value >> 13) & 0x1;

        s->data_type_f2 = (1 << ((value >> 11) & 0x3));

        s->brust_f1 = (value >> 7) & 0x3;

        s->pack_f1 = (value >> 6) & 0x1;

        s->data_type_f1 = (1 << ((value >> 0) & 0x3));

        break;

    case 0xbc2:        /* DMA_LCD_CCR */

        s->mode_f2 = (value >> 14) & 0x3;

        s->mode_f1 = (value >> 12) & 0x3;

        s->end_prog = (value >> 11) & 0x1;

        s->omap_3_1_compatible_disable = (value >> 10) & 0x1;

        s->repeat = (value >> 9) & 0x1;

        s->auto_init = (value >> 8) & 0x1;

        s->running = (value >> 7) & 0x1;

        s->priority = (value >> 6) & 0x1;

        s->bs = (value >> 4) & 0x1;

        break;

    case 0xbc4:        /* DMA_LCD_CTRL */

        s->dst = (value >> 8) & 0x1;

        s->src = ((value >> 6) & 0x3) << 1;

        s->condition = 0;

        /* Assume no bus errors and thus no BUS_ERROR irq bits.  */

        s->interrupts = (value >> 1) & 1;

        s->dual = value & 1;

        break;

    case 0xbc8:        /* TOP_B1_L */

        s->src_f1_top &= 0xffff0000;

        s->src_f1_top |= 0x0000ffff & value;

        break;

    case 0xbca:        /* TOP_B1_U */

        s->src_f1_top &= 0x0000ffff;

        s->src_f1_top |= value << 16;

        break;

    case 0xbcc:        /* BOT_B1_L */

        s->src_f1_bottom &= 0xffff0000;

        s->src_f1_bottom |= 0x0000ffff & value;

        break;

    case 0xbce:        /* BOT_B1_U */

        s->src_f1_bottom &= 0x0000ffff;

        s->src_f1_bottom |= (uint32_t) value << 16;

        break;

    case 0xbd0:        /* TOP_B2_L */

        s->src_f2_top &= 0xffff0000;

        s->src_f2_top |= 0x0000ffff & value;

        break;

    case 0xbd2:        /* TOP_B2_U */

        s->src_f2_top &= 0x0000ffff;

        s->src_f2_top |= (uint32_t) value << 16;

        break;

    case 0xbd4:        /* BOT_B2_L */

        s->src_f2_bottom &= 0xffff0000;

        s->src_f2_bottom |= 0x0000ffff & value;

        break;

    case 0xbd6:        /* BOT_B2_U */

        s->src_f2_bottom &= 0x0000ffff;

        s->src_f2_bottom |= (uint32_t) value << 16;

        break;

    case 0xbd8:        /* DMA_LCD_SRC_EI_B1 */

        s->element_index_f1 = value;

        break;

    case 0xbda:        /* DMA_LCD_SRC_FI_B1_L */

        s->frame_index_f1 &= 0xffff0000;

        s->frame_index_f1 |= 0x0000ffff & value;

        break;