[qemu.git] / hw / xilinx_axidma.c

/*
 * QEMU model of Xilinx AXI-DMA block.
 *
 * Copyright (c) 2011 Edgar E. Iglesias.
 *
 * 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 "qemu-char.h"
#include "qemu-timer.h"
#include "ptimer.h"
#include "qemu-log.h"
#include "qdev-addr.h"

#include "xilinx_axidma.h"

#define D(x)

#define R_DMACR             (0x00 / 4)
#define R_DMASR             (0x04 / 4)
#define R_CURDESC           (0x08 / 4)
#define R_TAILDESC          (0x10 / 4)
#define R_MAX               (0x30 / 4)

enum {
    DMACR_RUNSTOP = 1,
    DMACR_TAILPTR_MODE = 2,
    DMACR_RESET = 4
};

enum {
    DMASR_HALTED = 1,
    DMASR_IDLE  = 2,
    DMASR_IOC_IRQ  = 1 << 12,
    DMASR_DLY_IRQ  = 1 << 13,

    DMASR_IRQ_MASK = 7 << 12
};

struct SDesc {
    uint64_t nxtdesc;
    uint64_t buffer_address;
    uint64_t reserved;
    uint32_t control;
    uint32_t status;
    uint32_t app[6];
};

enum {
    SDESC_CTRL_EOF = (1 << 26),
    SDESC_CTRL_SOF = (1 << 27),

    SDESC_CTRL_LEN_MASK = (1 << 23) - 1
};

enum {
    SDESC_STATUS_EOF = (1 << 26),
    SDESC_STATUS_SOF_BIT = 27,
    SDESC_STATUS_SOF = (1 << SDESC_STATUS_SOF_BIT),
    SDESC_STATUS_COMPLETE = (1 << 31)
};

struct AXIStream {
    QEMUBH *bh;
    ptimer_state *ptimer;
    qemu_irq irq;

    int nr;

    struct SDesc desc;
    int pos;
    unsigned int complete_cnt;
    uint32_t regs[R_MAX];
};

struct XilinxAXIDMA {
    SysBusDevice busdev;
    MemoryRegion iomem;
    uint32_t freqhz;
    void *dmach;

    struct AXIStream streams[2];
};

/*
 * Helper calls to extract info from desriptors and other trivial
 * state from regs.
 */
static inline int stream_desc_sof(struct SDesc *d)
{
    return d->control & SDESC_CTRL_SOF;
}

static inline int stream_desc_eof(struct SDesc *d)
{
    return d->control & SDESC_CTRL_EOF;
}

static inline int stream_resetting(struct AXIStream *s)
{
    return !!(s->regs[R_DMACR] & DMACR_RESET);
}

static inline int stream_running(struct AXIStream *s)
{
    return s->regs[R_DMACR] & DMACR_RUNSTOP;
}

static inline int stream_halted(struct AXIStream *s)
{
    return s->regs[R_DMASR] & DMASR_HALTED;
}

static inline int stream_idle(struct AXIStream *s)
{
    return !!(s->regs[R_DMASR] & DMASR_IDLE);
}

static void stream_reset(struct AXIStream *s)
{
    s->regs[R_DMASR] = DMASR_HALTED;  /* starts up halted.  */
    s->regs[R_DMACR] = 1 << 16; /* Starts with one in compl threshold.  */
}

/* Map an offset addr into a channel index.  */
static inline int streamid_from_addr(target_phys_addr_t addr)
{
    int sid;

    sid = addr / (0x30);
    sid &= 1;
    return sid;
}

#ifdef DEBUG_ENET
static void stream_desc_show(struct SDesc *d)
{
    qemu_log("buffer_addr  = " PRIx64 "\n", d->buffer_address);
    qemu_log("nxtdesc      = " PRIx64 "\n", d->nxtdesc);
    qemu_log("control      = %x\n", d->control);
    qemu_log("status       = %x\n", d->status);
}
#endif

static void stream_desc_load(struct AXIStream *s, target_phys_addr_t addr)
{
    struct SDesc *d = &s->desc;
    int i;

    cpu_physical_memory_read(addr, (void *) d, sizeof *d);

    /* Convert from LE into host endianness.  */
    d->buffer_address = le64_to_cpu(d->buffer_address);
    d->nxtdesc = le64_to_cpu(d->nxtdesc);
    d->control = le32_to_cpu(d->control);
    d->status = le32_to_cpu(d->status);
    for (i = 0; i < ARRAY_SIZE(d->app); i++) {
        d->app[i] = le32_to_cpu(d->app[i]);
    }
}

static void stream_desc_store(struct AXIStream *s, target_phys_addr_t addr)
{
    struct SDesc *d = &s->desc;
    int i;

    /* Convert from host endianness into LE.  */
    d->buffer_address = cpu_to_le64(d->buffer_address);
    d->nxtdesc = cpu_to_le64(d->nxtdesc);
    d->control = cpu_to_le32(d->control);
    d->status = cpu_to_le32(d->status);
    for (i = 0; i < ARRAY_SIZE(d->app); i++) {
        d->app[i] = cpu_to_le32(d->app[i]);
    }
    cpu_physical_memory_write(addr, (void *) d, sizeof *d);
}

static void stream_update_irq(struct AXIStream *s)
{
    unsigned int pending, mask, irq;

    pending = s->regs[R_DMASR] & DMASR_IRQ_MASK;
    mask = s->regs[R_DMACR] & DMASR_IRQ_MASK;

    irq = pending & mask;

    qemu_set_irq(s->irq, !!irq);
}

static void stream_reload_complete_cnt(struct AXIStream *s)
{
    unsigned int comp_th;
    comp_th = (s->regs[R_DMACR] >> 16) & 0xff;
    s->complete_cnt = comp_th;
}

static void timer_hit(void *opaque)
{
    struct AXIStream *s = opaque;

    stream_reload_complete_cnt(s);
    s->regs[R_DMASR] |= DMASR_DLY_IRQ;
    stream_update_irq(s);
}

static void stream_complete(struct AXIStream *s)
{
    unsigned int comp_delay;

    /* Start the delayed timer.  */
    comp_delay = s->regs[R_DMACR] >> 24;
    if (comp_delay) {
        ptimer_stop(s->ptimer);
        ptimer_set_count(s->ptimer, comp_delay);
        ptimer_run(s->ptimer, 1);
    }

    s->complete_cnt--;
    if (s->complete_cnt == 0) {
        /* Raise the IOC irq.  */
        s->regs[R_DMASR] |= DMASR_IOC_IRQ;
        stream_reload_complete_cnt(s);
    }
}

static void stream_process_mem2s(struct AXIStream *s,
                                 struct XilinxDMAConnection *dmach)
{
    uint32_t prev_d;
    unsigned char txbuf[16 * 1024];
    unsigned int txlen;
    uint32_t app[6];

    if (!stream_running(s) || stream_idle(s)) {
        return;
    }

    while (1) {
        stream_desc_load(s, s->regs[R_CURDESC]);

        if (s->desc.status & SDESC_STATUS_COMPLETE) {
            s->regs[R_DMASR] |= DMASR_IDLE;
            break;
        }

        if (stream_desc_sof(&s->desc)) {
            s->pos = 0;
            memcpy(app, s->desc.app, sizeof app);
        }

        txlen = s->desc.control & SDESC_CTRL_LEN_MASK;
        if ((txlen + s->pos) > sizeof txbuf) {
            hw_error("%s: too small internal txbuf! %d\n", __func__,
                     txlen + s->pos);
        }

        cpu_physical_memory_read(s->desc.buffer_address,
                                 txbuf + s->pos, txlen);
        s->pos += txlen;

        if (stream_desc_eof(&s->desc)) {
            xlx_dma_push_to_client(dmach, txbuf, s->pos, app);
            s->pos = 0;
            stream_complete(s);
        }

        /* Update the descriptor.  */
        s->desc.status = txlen | SDESC_STATUS_COMPLETE;
        stream_desc_store(s, s->regs[R_CURDESC]);

        /* Advance.  */
        prev_d = s->regs[R_CURDESC];
        s->regs[R_CURDESC] = s->desc.nxtdesc;
        if (prev_d == s->regs[R_TAILDESC]) {
            s->regs[R_DMASR] |= DMASR_IDLE;
            break;
        }
    }
}

static void stream_process_s2mem(struct AXIStream *s,
                                 unsigned char *buf, size_t len, uint32_t *app)
{
    uint32_t prev_d;
    unsigned int rxlen;
    int pos = 0;
    int sof = 1;

    if (!stream_running(s) || stream_idle(s)) {
        return;
    }

    while (len) {
        stream_desc_load(s, s->regs[R_CURDESC]);

        if (s->desc.status & SDESC_STATUS_COMPLETE) {
            s->regs[R_DMASR] |= DMASR_IDLE;
            break;
        }

        rxlen = s->desc.control & SDESC_CTRL_LEN_MASK;
        if (rxlen > len) {
            /* It fits.  */
            rxlen = len;
        }

        cpu_physical_memory_write(s->desc.buffer_address, buf + pos, rxlen);
        len -= rxlen;
        pos += rxlen;

        /* Update the descriptor.  */
        if (!len) {
            int i;

            stream_complete(s);
            for (i = 0; i < 5; i++) {
                s->desc.app[i] = app[i];
            }
            s->desc.status |= SDESC_STATUS_EOF;
        }

        s->desc.status |= sof << SDESC_STATUS_SOF_BIT;
        s->desc.status |= SDESC_STATUS_COMPLETE;
        stream_desc_store(s, s->regs[R_CURDESC]);
        sof = 0;

        /* Advance.  */
        prev_d = s->regs[R_CURDESC];
        s->regs[R_CURDESC] = s->desc.nxtdesc;
        if (prev_d == s->regs[R_TAILDESC]) {
            s->regs[R_DMASR] |= DMASR_IDLE;
            break;
        }
    }
}

static
void axidma_push(void *opaque, unsigned char *buf, size_t len, uint32_t *app)
{
    struct XilinxAXIDMA *d = opaque;
    struct AXIStream *s = &d->streams[1];

    if (!app) {
        hw_error("No stream app data!\n");
    }
    stream_process_s2mem(s, buf, len, app);
    stream_update_irq(s);
}

static uint64_t axidma_read(void *opaque, target_phys_addr_t addr,
                            unsigned size)
{
    struct XilinxAXIDMA *d = opaque;
    struct AXIStream *s;
    uint32_t r = 0;
    int sid;

    sid = streamid_from_addr(addr);
    s = &d->streams[sid];

    addr = addr % 0x30;
    addr >>= 2;
    switch (addr) {
        case R_DMACR:
            /* Simulate one cycles reset delay.  */
            s->regs[addr] &= ~DMACR_RESET;
            r = s->regs[addr];
            break;
        case R_DMASR:
            s->regs[addr] &= 0xffff;
            s->regs[addr] |= (s->complete_cnt & 0xff) << 16;
            s->regs[addr] |= (ptimer_get_count(s->ptimer) & 0xff) << 24;
            r = s->regs[addr];
            break;
        default:
            r = s->regs[addr];
            D(qemu_log("%s ch=%d addr=" TARGET_FMT_plx " v=%x\n",
                           __func__, sid, addr * 4, r));
            break;
    }
    return r;

}

static void axidma_write(void *opaque, target_phys_addr_t addr,
                         uint64_t value, unsigned size)
{
    struct XilinxAXIDMA *d = opaque;
    struct AXIStream *s;
    int sid;

    sid = streamid_from_addr(addr);
    s = &d->streams[sid];

    addr = addr % 0x30;
    addr >>= 2;
    switch (addr) {
        case R_DMACR:
            /* Tailptr mode is always on.  */
            value |= DMACR_TAILPTR_MODE;
            /* Remember our previous reset state.  */
            value |= (s->regs[addr] & DMACR_RESET);
            s->regs[addr] = value;

            if (value & DMACR_RESET) {
                stream_reset(s);
            }

            if ((value & 1) && !stream_resetting(s)) {
                /* Start processing.  */
                s->regs[R_DMASR] &= ~(DMASR_HALTED | DMASR_IDLE);
            }
            stream_reload_complete_cnt(s);
            break;

        case R_DMASR:
            /* Mask away write to clear irq lines.  */
            value &= ~(value & DMASR_IRQ_MASK);
            s->regs[addr] = value;
            break;

        case R_TAILDESC:
            s->regs[addr] = value;
            s->regs[R_DMASR] &= ~DMASR_IDLE; /* Not idle.  */
            if (!sid) {
                stream_process_mem2s(s, d->dmach);
            }
            break;
        default:
            D(qemu_log("%s: ch=%d addr=" TARGET_FMT_plx " v=%x\n",
                  __func__, sid, addr * 4, value));
            s->regs[addr] = value;
            break;
    }
    stream_update_irq(s);
}

static const MemoryRegionOps axidma_ops = {
    .read = axidma_read,
    .write = axidma_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static int xilinx_axidma_init(SysBusDevice *dev)
{
    struct XilinxAXIDMA *s = FROM_SYSBUS(typeof(*s), dev);
    int i;

    sysbus_init_irq(dev, &s->streams[1].irq);
    sysbus_init_irq(dev, &s->streams[0].irq);

    if (!s->dmach) {
        hw_error("Unconnected DMA channel.\n");
    }

    xlx_dma_connect_dma(s->dmach, s, axidma_push);

    memory_region_init_io(&s->iomem, &axidma_ops, s,
                          "axidma", R_MAX * 4 * 2);
    sysbus_init_mmio(dev, &s->iomem);

    for (i = 0; i < 2; i++) {
        stream_reset(&s->streams[i]);
        s->streams[i].nr = i;
        s->streams[i].bh = qemu_bh_new(timer_hit, &s->streams[i]);
        s->streams[i].ptimer = ptimer_init(s->streams[i].bh);
        ptimer_set_freq(s->streams[i].ptimer, s->freqhz);
    }
    return 0;
}

static Property axidma_properties[] = {
    DEFINE_PROP_UINT32("freqhz", struct XilinxAXIDMA, freqhz, 50000000),
    DEFINE_PROP_PTR("dmach", struct XilinxAXIDMA, dmach),
    DEFINE_PROP_END_OF_LIST(),
};

static void axidma_class_init(ObjectClass *klass, void *data)
{
    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = xilinx_axidma_init;
}

static DeviceInfo axidma_info = {
    .name = "xilinx,axidma",
    .size = sizeof(struct XilinxAXIDMA),
    .props = axidma_properties,
    .class_init = axidma_class_init,
};

static void xilinx_axidma_register(void)
{
    sysbus_register_withprop(&axidma_info);
}

device_init(xilinx_axidma_register)
Commit	Line	Data
93f1e401 EI	1	/*
	2	* QEMU model of Xilinx AXI-DMA block.
	3	*
	4	* Copyright (c) 2011 Edgar E. Iglesias.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24
	25	#include "sysbus.h"
	26	#include "qemu-char.h"
	27	#include "qemu-timer.h"
49d4d9b6	28	#include "ptimer.h"
93f1e401 EI	29	#include "qemu-log.h"
	30	#include "qdev-addr.h"
	31
	32	#include "xilinx_axidma.h"
	33
	34	#define D(x)
	35
	36	#define R_DMACR (0x00 / 4)
	37	#define R_DMASR (0x04 / 4)
	38	#define R_CURDESC (0x08 / 4)
	39	#define R_TAILDESC (0x10 / 4)
	40	#define R_MAX (0x30 / 4)
	41
	42	enum {
	43	DMACR_RUNSTOP = 1,
	44	DMACR_TAILPTR_MODE = 2,
	45	DMACR_RESET = 4
	46	};
	47
	48	enum {
	49	DMASR_HALTED = 1,
	50	DMASR_IDLE = 2,
	51	DMASR_IOC_IRQ = 1 << 12,
	52	DMASR_DLY_IRQ = 1 << 13,
	53
	54	DMASR_IRQ_MASK = 7 << 12
	55	};
	56
	57	struct SDesc {
	58	uint64_t nxtdesc;
	59	uint64_t buffer_address;
	60	uint64_t reserved;
	61	uint32_t control;
	62	uint32_t status;
	63	uint32_t app[6];
	64	};
	65
	66	enum {
	67	SDESC_CTRL_EOF = (1 << 26),
	68	SDESC_CTRL_SOF = (1 << 27),
	69
	70	SDESC_CTRL_LEN_MASK = (1 << 23) - 1
	71	};
	72
	73	enum {
	74	SDESC_STATUS_EOF = (1 << 26),
	75	SDESC_STATUS_SOF_BIT = 27,
	76	SDESC_STATUS_SOF = (1 << SDESC_STATUS_SOF_BIT),
	77	SDESC_STATUS_COMPLETE = (1 << 31)
	78	};
	79
	80	struct AXIStream {
	81	QEMUBH *bh;
	82	ptimer_state *ptimer;
	83	qemu_irq irq;
	84
	85	int nr;
	86
	87	struct SDesc desc;
	88	int pos;
	89	unsigned int complete_cnt;
	90	uint32_t regs[R_MAX];
	91	};
	92
93	struct XilinxAXIDMA {
94	SysBusDevice busdev;
f810bc4a	95	MemoryRegion iomem;
93f1e401 EI	96	uint32_t freqhz;
	97	void *dmach;
	98
	99	struct AXIStream streams[2];
	100	};
	101
	102	/*
	103	* Helper calls to extract info from desriptors and other trivial
	104	* state from regs.
	105	*/
	106	static inline int stream_desc_sof(struct SDesc *d)
	107	{
	108	return d->control & SDESC_CTRL_SOF;
	109	}
	110
	111	static inline int stream_desc_eof(struct SDesc *d)
	112	{
	113	return d->control & SDESC_CTRL_EOF;
	114	}
	115
	116	static inline int stream_resetting(struct AXIStream *s)
	117	{
	118	return !!(s->regs[R_DMACR] & DMACR_RESET);
	119	}
	120
	121	static inline int stream_running(struct AXIStream *s)
	122	{
	123	return s->regs[R_DMACR] & DMACR_RUNSTOP;
	124	}
	125
	126	static inline int stream_halted(struct AXIStream *s)
	127	{
	128	return s->regs[R_DMASR] & DMASR_HALTED;
	129	}
	130
	131	static inline int stream_idle(struct AXIStream *s)
	132	{
	133	return !!(s->regs[R_DMASR] & DMASR_IDLE);
	134	}
	135
	136	static void stream_reset(struct AXIStream *s)
	137	{
	138	s->regs[R_DMASR] = DMASR_HALTED; /* starts up halted. */
0d50d616	139	s->regs[R_DMACR] = 1 << 16; /* Starts with one in compl threshold. */
93f1e401 EI	140	}
93f1e401 EI	141
0d50d616	142	/* Map an offset addr into a channel index. */
93f1e401 EI	143	static inline int streamid_from_addr(target_phys_addr_t addr)
	144	{
	145	int sid;
	146
	147	sid = addr / (0x30);
	148	sid &= 1;
	149	return sid;
	150	}
	151
	152	#ifdef DEBUG_ENET
	153	static void stream_desc_show(struct SDesc *d)
	154	{
	155	qemu_log("buffer_addr = " PRIx64 "\n", d->buffer_address);
	156	qemu_log("nxtdesc = " PRIx64 "\n", d->nxtdesc);
	157	qemu_log("control = %x\n", d->control);
	158	qemu_log("status = %x\n", d->status);
	159	}
	160	#endif
	161
	162	static void stream_desc_load(struct AXIStream *s, target_phys_addr_t addr)
	163	{
	164	struct SDesc *d = &s->desc;
	165	int i;
	166
	167	cpu_physical_memory_read(addr, (void ) d, sizeof d);
	168
	169	/* Convert from LE into host endianness. */
	170	d->buffer_address = le64_to_cpu(d->buffer_address);
	171	d->nxtdesc = le64_to_cpu(d->nxtdesc);
	172	d->control = le32_to_cpu(d->control);
	173	d->status = le32_to_cpu(d->status);
	174	for (i = 0; i < ARRAY_SIZE(d->app); i++) {
	175	d->app[i] = le32_to_cpu(d->app[i]);
	176	}
	177	}
	178
	179	static void stream_desc_store(struct AXIStream *s, target_phys_addr_t addr)
	180	{
	181	struct SDesc *d = &s->desc;
	182	int i;
	183
	184	/* Convert from host endianness into LE. */
	185	d->buffer_address = cpu_to_le64(d->buffer_address);
	186	d->nxtdesc = cpu_to_le64(d->nxtdesc);
	187	d->control = cpu_to_le32(d->control);
	188	d->status = cpu_to_le32(d->status);
	189	for (i = 0; i < ARRAY_SIZE(d->app); i++) {
	190	d->app[i] = cpu_to_le32(d->app[i]);
	191	}
	192	cpu_physical_memory_write(addr, (void ) d, sizeof d);
	193	}
	194
	195	static void stream_update_irq(struct AXIStream *s)
	196	{
	197	unsigned int pending, mask, irq;
	198
	199	pending = s->regs[R_DMASR] & DMASR_IRQ_MASK;
	200	mask = s->regs[R_DMACR] & DMASR_IRQ_MASK;
	201
	202	irq = pending & mask;
	203
	204	qemu_set_irq(s->irq, !!irq);
	205	}
	206
207	static void stream_reload_complete_cnt(struct AXIStream *s)
208	{
209	unsigned int comp_th;
210	comp_th = (s->regs[R_DMACR] >> 16) & 0xff;
211	s->complete_cnt = comp_th;
212	}
213
214	static void timer_hit(void *opaque)
215	{
216	struct AXIStream *s = opaque;
217
218	stream_reload_complete_cnt(s);
219	s->regs[R_DMASR] \|= DMASR_DLY_IRQ;
220	stream_update_irq(s);
221	}
222
223	static void stream_complete(struct AXIStream *s)
224	{
225	unsigned int comp_delay;
226
227	/* Start the delayed timer. */
228	comp_delay = s->regs[R_DMACR] >> 24;
229	if (comp_delay) {
230	ptimer_stop(s->ptimer);
231	ptimer_set_count(s->ptimer, comp_delay);
232	ptimer_run(s->ptimer, 1);
233	}
234
235	s->complete_cnt--;
236	if (s->complete_cnt == 0) {
237	/* Raise the IOC irq. */
238	s->regs[R_DMASR] \|= DMASR_IOC_IRQ;
239	stream_reload_complete_cnt(s);
240	}
241	}
242
243	static void stream_process_mem2s(struct AXIStream *s,
244	struct XilinxDMAConnection *dmach)
245	{
246	uint32_t prev_d;
247	unsigned char txbuf[16 * 1024];
248	unsigned int txlen;
249	uint32_t app[6];
250
251	if (!stream_running(s) \|\| stream_idle(s)) {
252	return;
253	}
254
255	while (1) {
256	stream_desc_load(s, s->regs[R_CURDESC]);
257
258	if (s->desc.status & SDESC_STATUS_COMPLETE) {
259	s->regs[R_DMASR] \|= DMASR_IDLE;
260	break;
261	}
262
263	if (stream_desc_sof(&s->desc)) {
264	s->pos = 0;
265	memcpy(app, s->desc.app, sizeof app);
266	}
267
268	txlen = s->desc.control & SDESC_CTRL_LEN_MASK;
269	if ((txlen + s->pos) > sizeof txbuf) {
270	hw_error("%s: too small internal txbuf! %d\n", __func__,
271	txlen + s->pos);
272	}
273
274	cpu_physical_memory_read(s->desc.buffer_address,
275	txbuf + s->pos, txlen);
276	s->pos += txlen;
277
278	if (stream_desc_eof(&s->desc)) {
279	xlx_dma_push_to_client(dmach, txbuf, s->pos, app);
280	s->pos = 0;
281	stream_complete(s);
282	}
283
284	/* Update the descriptor. */
285	s->desc.status = txlen \| SDESC_STATUS_COMPLETE;
286	stream_desc_store(s, s->regs[R_CURDESC]);
287
288	/* Advance. */
289	prev_d = s->regs[R_CURDESC];
290	s->regs[R_CURDESC] = s->desc.nxtdesc;
291	if (prev_d == s->regs[R_TAILDESC]) {
292	s->regs[R_DMASR] \|= DMASR_IDLE;
293	break;
294	}
295	}
296	}
297
298	static void stream_process_s2mem(struct AXIStream *s,
299	unsigned char buf, size_t len, uint32_t app)
300	{
301	uint32_t prev_d;
302	unsigned int rxlen;
303	int pos = 0;
304	int sof = 1;
305
306	if (!stream_running(s) \|\| stream_idle(s)) {
307	return;
308	}
309
310	while (len) {
311	stream_desc_load(s, s->regs[R_CURDESC]);
312
313	if (s->desc.status & SDESC_STATUS_COMPLETE) {
314	s->regs[R_DMASR] \|= DMASR_IDLE;
315	break;
316	}
317
318	rxlen = s->desc.control & SDESC_CTRL_LEN_MASK;
319	if (rxlen > len) {
320	/* It fits. */
321	rxlen = len;
322	}
323
324	cpu_physical_memory_write(s->desc.buffer_address, buf + pos, rxlen);
325	len -= rxlen;
326	pos += rxlen;
327
328	/* Update the descriptor. */
329	if (!len) {
330	int i;
331
332	stream_complete(s);
333	for (i = 0; i < 5; i++) {
334	s->desc.app[i] = app[i];
335	}
336	s->desc.status \|= SDESC_STATUS_EOF;
337	}
338
339	s->desc.status \|= sof << SDESC_STATUS_SOF_BIT;
340	s->desc.status \|= SDESC_STATUS_COMPLETE;
341	stream_desc_store(s, s->regs[R_CURDESC]);
342	sof = 0;
343
344	/* Advance. */
345	prev_d = s->regs[R_CURDESC];
346	s->regs[R_CURDESC] = s->desc.nxtdesc;
347	if (prev_d == s->regs[R_TAILDESC]) {
348	s->regs[R_DMASR] \|= DMASR_IDLE;
349	break;
350	}
351	}
352	}
353
354	static
355	void axidma_push(void opaque, unsigned char buf, size_t len, uint32_t *app)
356	{
357	struct XilinxAXIDMA *d = opaque;
358	struct AXIStream *s = &d->streams[1];
359
360	if (!app) {
361	hw_error("No stream app data!\n");
362	}
363	stream_process_s2mem(s, buf, len, app);
364	stream_update_irq(s);
365	}
366
f810bc4a AK	367	static uint64_t axidma_read(void *opaque, target_phys_addr_t addr,
f810bc4a AK	368	unsigned size)
93f1e401 EI	369	{
	370	struct XilinxAXIDMA *d = opaque;
	371	struct AXIStream *s;
	372	uint32_t r = 0;
	373	int sid;
	374
	375	sid = streamid_from_addr(addr);
	376	s = &d->streams[sid];
	377
	378	addr = addr % 0x30;
	379	addr >>= 2;
	380	switch (addr) {
	381	case R_DMACR:
	382	/* Simulate one cycles reset delay. */
	383	s->regs[addr] &= ~DMACR_RESET;
	384	r = s->regs[addr];
	385	break;
	386	case R_DMASR:
	387	s->regs[addr] &= 0xffff;
	388	s->regs[addr] \|= (s->complete_cnt & 0xff) << 16;
	389	s->regs[addr] \|= (ptimer_get_count(s->ptimer) & 0xff) << 24;
	390	r = s->regs[addr];
	391	break;
	392	default:
	393	r = s->regs[addr];
	394	D(qemu_log("%s ch=%d addr=" TARGET_FMT_plx " v=%x\n",
	395	__func__, sid, addr * 4, r));
	396	break;
	397	}
	398	return r;
	399
	400	}
	401
f810bc4a AK	402	static void axidma_write(void *opaque, target_phys_addr_t addr,
f810bc4a AK	403	uint64_t value, unsigned size)
93f1e401 EI	404	{
	405	struct XilinxAXIDMA *d = opaque;
	406	struct AXIStream *s;
	407	int sid;
	408
	409	sid = streamid_from_addr(addr);
	410	s = &d->streams[sid];
	411
	412	addr = addr % 0x30;
	413	addr >>= 2;
	414	switch (addr) {
	415	case R_DMACR:
	416	/* Tailptr mode is always on. */
	417	value \|= DMACR_TAILPTR_MODE;
	418	/* Remember our previous reset state. */
	419	value \|= (s->regs[addr] & DMACR_RESET);
	420	s->regs[addr] = value;
	421
	422	if (value & DMACR_RESET) {
	423	stream_reset(s);
	424	}
	425
	426	if ((value & 1) && !stream_resetting(s)) {
	427	/* Start processing. */
	428	s->regs[R_DMASR] &= ~(DMASR_HALTED \| DMASR_IDLE);
	429	}
	430	stream_reload_complete_cnt(s);
	431	break;
	432
	433	case R_DMASR:
	434	/* Mask away write to clear irq lines. */
	435	value &= ~(value & DMASR_IRQ_MASK);
	436	s->regs[addr] = value;
	437	break;
	438
	439	case R_TAILDESC:
	440	s->regs[addr] = value;
	441	s->regs[R_DMASR] &= ~DMASR_IDLE; /* Not idle. */
	442	if (!sid) {
	443	stream_process_mem2s(s, d->dmach);
	444	}
	445	break;
	446	default:
	447	D(qemu_log("%s: ch=%d addr=" TARGET_FMT_plx " v=%x\n",
	448	__func__, sid, addr * 4, value));
	449	s->regs[addr] = value;
	450	break;
	451	}
	452	stream_update_irq(s);
	453	}
	454
f810bc4a AK	455	static const MemoryRegionOps axidma_ops = {
	456	.read = axidma_read,
	457	.write = axidma_write,
	458	.endianness = DEVICE_NATIVE_ENDIAN,
93f1e401 EI	459	};
	460
	461	static int xilinx_axidma_init(SysBusDevice *dev)
	462	{
	463	struct XilinxAXIDMA s = FROM_SYSBUS(typeof(s), dev);
93f1e401 EI	464	int i;
	465
	466	sysbus_init_irq(dev, &s->streams[1].irq);
	467	sysbus_init_irq(dev, &s->streams[0].irq);
	468
	469	if (!s->dmach) {
	470	hw_error("Unconnected DMA channel.\n");
	471	}
	472
	473	xlx_dma_connect_dma(s->dmach, s, axidma_push);
	474
f810bc4a AK	475	memory_region_init_io(&s->iomem, &axidma_ops, s,
f810bc4a AK	476	"axidma", R_MAX * 4 * 2);
750ecd44	477	sysbus_init_mmio(dev, &s->iomem);
93f1e401 EI	478
	479	for (i = 0; i < 2; i++) {
	480	stream_reset(&s->streams[i]);
	481	s->streams[i].nr = i;
	482	s->streams[i].bh = qemu_bh_new(timer_hit, &s->streams[i]);
	483	s->streams[i].ptimer = ptimer_init(s->streams[i].bh);
	484	ptimer_set_freq(s->streams[i].ptimer, s->freqhz);
	485	}
	486	return 0;
	487	}
	488
999e12bb AL	489	static Property axidma_properties[] = {
	490	DEFINE_PROP_UINT32("freqhz", struct XilinxAXIDMA, freqhz, 50000000),
	491	DEFINE_PROP_PTR("dmach", struct XilinxAXIDMA, dmach),
	492	DEFINE_PROP_END_OF_LIST(),
	493	};
	494
	495	static void axidma_class_init(ObjectClass klass, void data)
	496	{
	497	SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
	498
	499	k->init = xilinx_axidma_init;
	500	}
	501
	502	static DeviceInfo axidma_info = {
	503	.name = "xilinx,axidma",
	504	.size = sizeof(struct XilinxAXIDMA),
	505	.props = axidma_properties,
	506	.class_init = axidma_class_init,
93f1e401 EI	507	};
	508
	509	static void xilinx_axidma_register(void)
	510	{
	511	sysbus_register_withprop(&axidma_info);
	512	}
	513
	514	device_init(xilinx_axidma_register)