[qemu.git] / hw / sh_serial.c

/*
 * QEMU SCI/SCIF serial port emulation
 *
 * Copyright (c) 2007 Magnus Damm
 *
 * Based on serial.c - QEMU 16450 UART emulation
 * Copyright (c) 2003-2004 Fabrice Bellard
 *
 * 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 "hw.h"
#include "sh.h"
#include "qemu-char.h"
#include "exec-memory.h"

//#define DEBUG_SERIAL

#define SH_SERIAL_FLAG_TEND (1 << 0)
#define SH_SERIAL_FLAG_TDE  (1 << 1)
#define SH_SERIAL_FLAG_RDF  (1 << 2)
#define SH_SERIAL_FLAG_BRK  (1 << 3)
#define SH_SERIAL_FLAG_DR   (1 << 4)

#define SH_RX_FIFO_LENGTH (16)

typedef struct {
    MemoryRegion iomem;
    MemoryRegion iomem_p4;
    MemoryRegion iomem_a7;
    uint8_t smr;
    uint8_t brr;
    uint8_t scr;
    uint8_t dr; /* ftdr / tdr */
    uint8_t sr; /* fsr / ssr */
    uint16_t fcr;
    uint8_t sptr;

    uint8_t rx_fifo[SH_RX_FIFO_LENGTH]; /* frdr / rdr */
    uint8_t rx_cnt;
    uint8_t rx_tail;
    uint8_t rx_head;

    int freq;
    int feat;
    int flags;
    int rtrg;

    CharDriverState *chr;

    qemu_irq eri;
    qemu_irq rxi;
    qemu_irq txi;
    qemu_irq tei;
    qemu_irq bri;
} sh_serial_state;

static void sh_serial_clear_fifo(sh_serial_state * s)
{
    memset(s->rx_fifo, 0, SH_RX_FIFO_LENGTH);
    s->rx_cnt = 0;
    s->rx_head = 0;
    s->rx_tail = 0;
}

static void sh_serial_write(void *opaque, target_phys_addr_t offs,
                            uint64_t val, unsigned size)
{
    sh_serial_state *s = opaque;
    unsigned char ch;

#ifdef DEBUG_SERIAL
    printf("sh_serial: write offs=0x%02x val=0x%02x\n",
	   offs, val);
#endif
    switch(offs) {
    case 0x00: /* SMR */
        s->smr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0x7b : 0xff);
        return;
    case 0x04: /* BRR */
        s->brr = val;
	return;
    case 0x08: /* SCR */
        /* TODO : For SH7751, SCIF mask should be 0xfb. */
        s->scr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0xfa : 0xff);
        if (!(val & (1 << 5)))
            s->flags |= SH_SERIAL_FLAG_TEND;
        if ((s->feat & SH_SERIAL_FEAT_SCIF) && s->txi) {
	    qemu_set_irq(s->txi, val & (1 << 7));
        }
        if (!(val & (1 << 6))) {
	    qemu_set_irq(s->rxi, 0);
        }
        return;
    case 0x0c: /* FTDR / TDR */
        if (s->chr) {
            ch = val;
            qemu_chr_fe_write(s->chr, &ch, 1);
	}
	s->dr = val;
	s->flags &= ~SH_SERIAL_FLAG_TDE;
        return;
#if 0
    case 0x14: /* FRDR / RDR */
        ret = 0;
        break;
#endif
    }
    if (s->feat & SH_SERIAL_FEAT_SCIF) {
        switch(offs) {
        case 0x10: /* FSR */
            if (!(val & (1 << 6)))
                s->flags &= ~SH_SERIAL_FLAG_TEND;
            if (!(val & (1 << 5)))
                s->flags &= ~SH_SERIAL_FLAG_TDE;
            if (!(val & (1 << 4)))
                s->flags &= ~SH_SERIAL_FLAG_BRK;
            if (!(val & (1 << 1)))
                s->flags &= ~SH_SERIAL_FLAG_RDF;
            if (!(val & (1 << 0)))
                s->flags &= ~SH_SERIAL_FLAG_DR;

            if (!(val & (1 << 1)) || !(val & (1 << 0))) {
                if (s->rxi) {
                    qemu_set_irq(s->rxi, 0);
                }
            }
            return;
        case 0x18: /* FCR */
            s->fcr = val;
            switch ((val >> 6) & 3) {
            case 0:
                s->rtrg = 1;
                break;
            case 1:
                s->rtrg = 4;
                break;
            case 2:
                s->rtrg = 8;
                break;
            case 3:
                s->rtrg = 14;
                break;
            }
            if (val & (1 << 1)) {
                sh_serial_clear_fifo(s);
                s->sr &= ~(1 << 1);
            }

            return;
        case 0x20: /* SPTR */
            s->sptr = val & 0xf3;
            return;
        case 0x24: /* LSR */
            return;
        }
    }
    else {
        switch(offs) {
#if 0
        case 0x0c:
            ret = s->dr;
            break;
        case 0x10:
            ret = 0;
            break;
#endif
        case 0x1c:
            s->sptr = val & 0x8f;
            return;
        }
    }

    fprintf(stderr, "sh_serial: unsupported write to 0x%02x\n", offs);
    abort();
}

static uint64_t sh_serial_read(void *opaque, target_phys_addr_t offs,
                               unsigned size)
{
    sh_serial_state *s = opaque;
    uint32_t ret = ~0;

#if 0
    switch(offs) {
    case 0x00:
        ret = s->smr;
        break;
    case 0x04:
        ret = s->brr;
	break;
    case 0x08:
        ret = s->scr;
        break;
    case 0x14:
        ret = 0;
        break;
    }
#endif
    if (s->feat & SH_SERIAL_FEAT_SCIF) {
        switch(offs) {
        case 0x00: /* SMR */
            ret = s->smr;
            break;
        case 0x08: /* SCR */
            ret = s->scr;
            break;
        case 0x10: /* FSR */
            ret = 0;
            if (s->flags & SH_SERIAL_FLAG_TEND)
                ret |= (1 << 6);
            if (s->flags & SH_SERIAL_FLAG_TDE)
                ret |= (1 << 5);
            if (s->flags & SH_SERIAL_FLAG_BRK)
                ret |= (1 << 4);
            if (s->flags & SH_SERIAL_FLAG_RDF)
                ret |= (1 << 1);
            if (s->flags & SH_SERIAL_FLAG_DR)
                ret |= (1 << 0);

            if (s->scr & (1 << 5))
                s->flags |= SH_SERIAL_FLAG_TDE | SH_SERIAL_FLAG_TEND;

            break;
        case 0x14:
            if (s->rx_cnt > 0) {
                ret = s->rx_fifo[s->rx_tail++];
                s->rx_cnt--;
                if (s->rx_tail == SH_RX_FIFO_LENGTH)
                    s->rx_tail = 0;
                if (s->rx_cnt < s->rtrg)
                    s->flags &= ~SH_SERIAL_FLAG_RDF;
            }
            break;
#if 0
        case 0x18:
            ret = s->fcr;
            break;
#endif
        case 0x1c:
            ret = s->rx_cnt;
            break;
        case 0x20:
            ret = s->sptr;
            break;
        case 0x24:
            ret = 0;
            break;
        }
    }
    else {
        switch(offs) {
#if 0
        case 0x0c:
            ret = s->dr;
            break;
        case 0x10:
            ret = 0;
            break;
        case 0x14:
            ret = s->rx_fifo[0];
            break;
#endif
        case 0x1c:
            ret = s->sptr;
            break;
        }
    }
#ifdef DEBUG_SERIAL
    printf("sh_serial: read offs=0x%02x val=0x%x\n",
	   offs, ret);
#endif

    if (ret & ~((1 << 16) - 1)) {
        fprintf(stderr, "sh_serial: unsupported read from 0x%02x\n", offs);
        abort();
    }

    return ret;
}

static int sh_serial_can_receive(sh_serial_state *s)
{
    return s->scr & (1 << 4);
}

static void sh_serial_receive_break(sh_serial_state *s)
{
    if (s->feat & SH_SERIAL_FEAT_SCIF)
        s->sr |= (1 << 4);
}

static int sh_serial_can_receive1(void *opaque)
{
    sh_serial_state *s = opaque;
    return sh_serial_can_receive(s);
}

static void sh_serial_receive1(void *opaque, const uint8_t *buf, int size)
{
    sh_serial_state *s = opaque;

    if (s->feat & SH_SERIAL_FEAT_SCIF) {
        int i;
        for (i = 0; i < size; i++) {
            if (s->rx_cnt < SH_RX_FIFO_LENGTH) {
                s->rx_fifo[s->rx_head++] = buf[i];
                if (s->rx_head == SH_RX_FIFO_LENGTH) {
                    s->rx_head = 0;
                }
                s->rx_cnt++;
                if (s->rx_cnt >= s->rtrg) {
                    s->flags |= SH_SERIAL_FLAG_RDF;
                    if (s->scr & (1 << 6) && s->rxi) {
                        qemu_set_irq(s->rxi, 1);
                    }
                }
            }
        }
    } else {
        s->rx_fifo[0] = buf[0];
    }
}

static void sh_serial_event(void *opaque, int event)
{
    sh_serial_state *s = opaque;
    if (event == CHR_EVENT_BREAK)
        sh_serial_receive_break(s);
}

static const MemoryRegionOps sh_serial_ops = {
    .read = sh_serial_read,
    .write = sh_serial_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

void sh_serial_init(MemoryRegion *sysmem,
                    target_phys_addr_t base, int feat,
                    uint32_t freq, CharDriverState *chr,
                    qemu_irq eri_source,
                    qemu_irq rxi_source,
                    qemu_irq txi_source,
                    qemu_irq tei_source,
                    qemu_irq bri_source)
{
    sh_serial_state *s;

    s = g_malloc0(sizeof(sh_serial_state));

    s->feat = feat;
    s->flags = SH_SERIAL_FLAG_TEND | SH_SERIAL_FLAG_TDE;
    s->rtrg = 1;

    s->smr = 0;
    s->brr = 0xff;
    s->scr = 1 << 5; /* pretend that TX is enabled so early printk works */
    s->sptr = 0;

    if (feat & SH_SERIAL_FEAT_SCIF) {
        s->fcr = 0;
    }
    else {
        s->dr = 0xff;
    }

    sh_serial_clear_fifo(s);

    memory_region_init_io(&s->iomem, &sh_serial_ops, s,
                          "serial", 0x100000000ULL);

    memory_region_init_alias(&s->iomem_p4, "serial-p4", &s->iomem,
                             0, 0x28);
    memory_region_add_subregion(sysmem, P4ADDR(base), &s->iomem_p4);

    memory_region_init_alias(&s->iomem_a7, "serial-a7", &s->iomem,
                             0, 0x28);
    memory_region_add_subregion(sysmem, A7ADDR(base), &s->iomem_a7);

    s->chr = chr;

    if (chr)
        qemu_chr_add_handlers(chr, sh_serial_can_receive1, sh_serial_receive1,
			      sh_serial_event, s);

    s->eri = eri_source;
    s->rxi = rxi_source;
    s->txi = txi_source;
    s->tei = tei_source;
    s->bri = bri_source;
}
Commit	Line	Data
2f062c72 TS	1	/*
	2	* QEMU SCI/SCIF serial port emulation
	3	*
	4	* Copyright (c) 2007 Magnus Damm
	5	*
	6	* Based on serial.c - QEMU 16450 UART emulation
	7	* Copyright (c) 2003-2004 Fabrice Bellard
	8	*
	9	* Permission is hereby granted, free of charge, to any person obtaining a copy
	10	* of this software and associated documentation files (the "Software"), to deal
	11	* in the Software without restriction, including without limitation the rights
	12	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	13	* copies of the Software, and to permit persons to whom the Software is
	14	* furnished to do so, subject to the following conditions:
	15	*
	16	* The above copyright notice and this permission notice shall be included in
	17	* all copies or substantial portions of the Software.
	18	*
	19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	20	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	21	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	22	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	23	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	24	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	25	* THE SOFTWARE.
	26	*/
87ecb68b PB	27	#include "hw.h"
	28	#include "sh.h"
	29	#include "qemu-char.h"
9a9d0b81	30	#include "exec-memory.h"
2f062c72 TS	31
	32	//#define DEBUG_SERIAL
	33
	34	#define SH_SERIAL_FLAG_TEND (1 << 0)
	35	#define SH_SERIAL_FLAG_TDE (1 << 1)
	36	#define SH_SERIAL_FLAG_RDF (1 << 2)
	37	#define SH_SERIAL_FLAG_BRK (1 << 3)
	38	#define SH_SERIAL_FLAG_DR (1 << 4)
	39
63242a00 AJ	40	#define SH_RX_FIFO_LENGTH (16)
63242a00 AJ	41
2f062c72	42	typedef struct {
9a9d0b81 BC	43	MemoryRegion iomem;
	44	MemoryRegion iomem_p4;
	45	MemoryRegion iomem_a7;
2f062c72 TS	46	uint8_t smr;
	47	uint8_t brr;
	48	uint8_t scr;
	49	uint8_t dr; /* ftdr / tdr */
	50	uint8_t sr; /* fsr / ssr */
	51	uint16_t fcr;
	52	uint8_t sptr;
	53
63242a00	54	uint8_t rx_fifo[SH_RX_FIFO_LENGTH]; /* frdr / rdr */
2f062c72	55	uint8_t rx_cnt;
63242a00 AJ	56	uint8_t rx_tail;
63242a00 AJ	57	uint8_t rx_head;
2f062c72	58
2f062c72 TS	59	int freq;
	60	int feat;
	61	int flags;
63242a00	62	int rtrg;
2f062c72 TS	63
2f062c72 TS	64	CharDriverState *chr;
bf5b7423	65
4e7ed2d1 AJ	66	qemu_irq eri;
	67	qemu_irq rxi;
	68	qemu_irq txi;
	69	qemu_irq tei;
	70	qemu_irq bri;
2f062c72 TS	71	} sh_serial_state;
2f062c72 TS	72
63242a00 AJ	73	static void sh_serial_clear_fifo(sh_serial_state * s)
	74	{
	75	memset(s->rx_fifo, 0, SH_RX_FIFO_LENGTH);
	76	s->rx_cnt = 0;
	77	s->rx_head = 0;
	78	s->rx_tail = 0;
	79	}
	80
9a9d0b81 BC	81	static void sh_serial_write(void *opaque, target_phys_addr_t offs,
9a9d0b81 BC	82	uint64_t val, unsigned size)
2f062c72 TS	83	{
	84	sh_serial_state *s = opaque;
	85	unsigned char ch;
	86
	87	#ifdef DEBUG_SERIAL
8da3ff18 PB	88	printf("sh_serial: write offs=0x%02x val=0x%02x\n",
8da3ff18 PB	89	offs, val);
2f062c72 TS	90	#endif
	91	switch(offs) {
	92	case 0x00: /* SMR */
	93	s->smr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0x7b : 0xff);
	94	return;
	95	case 0x04: /* BRR */
	96	s->brr = val;
	97	return;
	98	case 0x08: /* SCR */
63242a00	99	/* TODO : For SH7751, SCIF mask should be 0xfb. */
bf5b7423	100	s->scr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0xfa : 0xff);
2f062c72 TS	101	if (!(val & (1 << 5)))
2f062c72 TS	102	s->flags \|= SH_SERIAL_FLAG_TEND;
bf5b7423	103	if ((s->feat & SH_SERIAL_FEAT_SCIF) && s->txi) {
4e7ed2d1	104	qemu_set_irq(s->txi, val & (1 << 7));
bf5b7423	105	}
4e7ed2d1 AJ	106	if (!(val & (1 << 6))) {
4e7ed2d1 AJ	107	qemu_set_irq(s->rxi, 0);
63242a00	108	}
2f062c72 TS	109	return;
	110	case 0x0c: /* FTDR / TDR */
	111	if (s->chr) {
	112	ch = val;
2cc6e0a1	113	qemu_chr_fe_write(s->chr, &ch, 1);
2f062c72 TS	114	}
	115	s->dr = val;
	116	s->flags &= ~SH_SERIAL_FLAG_TDE;
	117	return;
	118	#if 0
	119	case 0x14: /* FRDR / RDR */
	120	ret = 0;
	121	break;
	122	#endif
	123	}
	124	if (s->feat & SH_SERIAL_FEAT_SCIF) {
	125	switch(offs) {
	126	case 0x10: /* FSR */
	127	if (!(val & (1 << 6)))
	128	s->flags &= ~SH_SERIAL_FLAG_TEND;
	129	if (!(val & (1 << 5)))
	130	s->flags &= ~SH_SERIAL_FLAG_TDE;
	131	if (!(val & (1 << 4)))
	132	s->flags &= ~SH_SERIAL_FLAG_BRK;
	133	if (!(val & (1 << 1)))
	134	s->flags &= ~SH_SERIAL_FLAG_RDF;
	135	if (!(val & (1 << 0)))
	136	s->flags &= ~SH_SERIAL_FLAG_DR;
63242a00 AJ	137
63242a00 AJ	138	if (!(val & (1 << 1)) \|\| !(val & (1 << 0))) {
4e7ed2d1 AJ	139	if (s->rxi) {
4e7ed2d1 AJ	140	qemu_set_irq(s->rxi, 0);
63242a00 AJ	141	}
63242a00 AJ	142	}
2f062c72 TS	143	return;
	144	case 0x18: /* FCR */
	145	s->fcr = val;
63242a00 AJ	146	switch ((val >> 6) & 3) {
	147	case 0:
	148	s->rtrg = 1;
	149	break;
	150	case 1:
	151	s->rtrg = 4;
	152	break;
	153	case 2:
	154	s->rtrg = 8;
	155	break;
	156	case 3:
	157	s->rtrg = 14;
	158	break;
	159	}
	160	if (val & (1 << 1)) {
	161	sh_serial_clear_fifo(s);
	162	s->sr &= ~(1 << 1);
	163	}
	164
2f062c72 TS	165	return;
2f062c72 TS	166	case 0x20: /* SPTR */
63242a00	167	s->sptr = val & 0xf3;
2f062c72 TS	168	return;
	169	case 0x24: /* LSR */
	170	return;
	171	}
	172	}
	173	else {
2f062c72	174	switch(offs) {
d1f193b0	175	#if 0
2f062c72 TS	176	case 0x0c:
	177	ret = s->dr;
	178	break;
	179	case 0x10:
	180	ret = 0;
	181	break;
d1f193b0	182	#endif
2f062c72	183	case 0x1c:
d1f193b0 AJ	184	s->sptr = val & 0x8f;
d1f193b0 AJ	185	return;
2f062c72	186	}
2f062c72 TS	187	}
	188
	189	fprintf(stderr, "sh_serial: unsupported write to 0x%02x\n", offs);
43dc2a64	190	abort();
2f062c72 TS	191	}
2f062c72 TS	192
9a9d0b81 BC	193	static uint64_t sh_serial_read(void *opaque, target_phys_addr_t offs,
9a9d0b81 BC	194	unsigned size)
2f062c72 TS	195	{
	196	sh_serial_state *s = opaque;
	197	uint32_t ret = ~0;
	198
	199	#if 0
	200	switch(offs) {
	201	case 0x00:
	202	ret = s->smr;
	203	break;
	204	case 0x04:
	205	ret = s->brr;
	206	break;
	207	case 0x08:
	208	ret = s->scr;
	209	break;
	210	case 0x14:
	211	ret = 0;
	212	break;
	213	}
	214	#endif
	215	if (s->feat & SH_SERIAL_FEAT_SCIF) {
	216	switch(offs) {
bf5b7423 AJ	217	case 0x00: /* SMR */
	218	ret = s->smr;
	219	break;
	220	case 0x08: /* SCR */
	221	ret = s->scr;
	222	break;
2f062c72 TS	223	case 0x10: /* FSR */
	224	ret = 0;
	225	if (s->flags & SH_SERIAL_FLAG_TEND)
	226	ret \|= (1 << 6);
	227	if (s->flags & SH_SERIAL_FLAG_TDE)
	228	ret \|= (1 << 5);
	229	if (s->flags & SH_SERIAL_FLAG_BRK)
	230	ret \|= (1 << 4);
	231	if (s->flags & SH_SERIAL_FLAG_RDF)
	232	ret \|= (1 << 1);
	233	if (s->flags & SH_SERIAL_FLAG_DR)
	234	ret \|= (1 << 0);
	235
63242a00	236	if (s->scr & (1 << 5))
2f062c72 TS	237	s->flags \|= SH_SERIAL_FLAG_TDE \| SH_SERIAL_FLAG_TEND;
2f062c72 TS	238
63242a00 AJ	239	break;
	240	case 0x14:
	241	if (s->rx_cnt > 0) {
	242	ret = s->rx_fifo[s->rx_tail++];
	243	s->rx_cnt--;
	244	if (s->rx_tail == SH_RX_FIFO_LENGTH)
	245	s->rx_tail = 0;
	246	if (s->rx_cnt < s->rtrg)
	247	s->flags &= ~SH_SERIAL_FLAG_RDF;
	248	}
2f062c72 TS	249	break;
	250	#if 0
	251	case 0x18:
	252	ret = s->fcr;
	253	break;
	254	#endif
	255	case 0x1c:
	256	ret = s->rx_cnt;
	257	break;
	258	case 0x20:
	259	ret = s->sptr;
	260	break;
	261	case 0x24:
	262	ret = 0;
	263	break;
	264	}
	265	}
	266	else {
2f062c72	267	switch(offs) {
d1f193b0	268	#if 0
2f062c72 TS	269	case 0x0c:
	270	ret = s->dr;
	271	break;
	272	case 0x10:
	273	ret = 0;
	274	break;
63242a00 AJ	275	case 0x14:
	276	ret = s->rx_fifo[0];
	277	break;
d1f193b0	278	#endif
2f062c72 TS	279	case 0x1c:
	280	ret = s->sptr;
	281	break;
	282	}
2f062c72 TS	283	}
2f062c72 TS	284	#ifdef DEBUG_SERIAL
8da3ff18 PB	285	printf("sh_serial: read offs=0x%02x val=0x%x\n",
8da3ff18 PB	286	offs, ret);
2f062c72 TS	287	#endif
	288
	289	if (ret & ~((1 << 16) - 1)) {
	290	fprintf(stderr, "sh_serial: unsupported read from 0x%02x\n", offs);
43dc2a64	291	abort();
2f062c72 TS	292	}
	293
	294	return ret;
	295	}
	296
	297	static int sh_serial_can_receive(sh_serial_state *s)
	298	{
63242a00	299	return s->scr & (1 << 4);
2f062c72 TS	300	}
2f062c72 TS	301
2f062c72 TS	302	static void sh_serial_receive_break(sh_serial_state *s)
2f062c72 TS	303	{
63242a00 AJ	304	if (s->feat & SH_SERIAL_FEAT_SCIF)
63242a00 AJ	305	s->sr \|= (1 << 4);
2f062c72 TS	306	}
	307
	308	static int sh_serial_can_receive1(void *opaque)
	309	{
	310	sh_serial_state *s = opaque;
	311	return sh_serial_can_receive(s);
	312	}
	313
	314	static void sh_serial_receive1(void opaque, const uint8_t buf, int size)
	315	{
	316	sh_serial_state *s = opaque;
b7d2b020 AJ	317
	318	if (s->feat & SH_SERIAL_FEAT_SCIF) {
	319	int i;
	320	for (i = 0; i < size; i++) {
	321	if (s->rx_cnt < SH_RX_FIFO_LENGTH) {
	322	s->rx_fifo[s->rx_head++] = buf[i];
	323	if (s->rx_head == SH_RX_FIFO_LENGTH) {
	324	s->rx_head = 0;
	325	}
	326	s->rx_cnt++;
	327	if (s->rx_cnt >= s->rtrg) {
	328	s->flags \|= SH_SERIAL_FLAG_RDF;
	329	if (s->scr & (1 << 6) && s->rxi) {
	330	qemu_set_irq(s->rxi, 1);
	331	}
	332	}
	333	}
	334	}
	335	} else {
	336	s->rx_fifo[0] = buf[0];
	337	}
2f062c72 TS	338	}
	339
	340	static void sh_serial_event(void *opaque, int event)
	341	{
	342	sh_serial_state *s = opaque;
	343	if (event == CHR_EVENT_BREAK)
	344	sh_serial_receive_break(s);
	345	}
	346
9a9d0b81 BC	347	static const MemoryRegionOps sh_serial_ops = {
	348	.read = sh_serial_read,
	349	.write = sh_serial_write,
	350	.endianness = DEVICE_NATIVE_ENDIAN,
2f062c72 TS	351	};
2f062c72 TS	352
9a9d0b81 BC	353	void sh_serial_init(MemoryRegion *sysmem,
	354	target_phys_addr_t base, int feat,
	355	uint32_t freq, CharDriverState *chr,
	356	qemu_irq eri_source,
	357	qemu_irq rxi_source,
	358	qemu_irq txi_source,
	359	qemu_irq tei_source,
	360	qemu_irq bri_source)
2f062c72 TS	361	{
2f062c72 TS	362	sh_serial_state *s;
2f062c72	363
7267c094	364	s = g_malloc0(sizeof(sh_serial_state));
2f062c72	365
2f062c72 TS	366	s->feat = feat;
2f062c72 TS	367	s->flags = SH_SERIAL_FLAG_TEND \| SH_SERIAL_FLAG_TDE;
63242a00	368	s->rtrg = 1;
2f062c72 TS	369
	370	s->smr = 0;
	371	s->brr = 0xff;
b7d35e65	372	s->scr = 1 << 5; /* pretend that TX is enabled so early printk works */
2f062c72 TS	373	s->sptr = 0;
	374
	375	if (feat & SH_SERIAL_FEAT_SCIF) {
	376	s->fcr = 0;
	377	}
	378	else {
	379	s->dr = 0xff;
	380	}
	381
63242a00	382	sh_serial_clear_fifo(s);
2f062c72	383
9a9d0b81 BC	384	memory_region_init_io(&s->iomem, &sh_serial_ops, s,
	385	"serial", 0x100000000ULL);
	386
	387	memory_region_init_alias(&s->iomem_p4, "serial-p4", &s->iomem,
	388	0, 0x28);
	389	memory_region_add_subregion(sysmem, P4ADDR(base), &s->iomem_p4);
	390
	391	memory_region_init_alias(&s->iomem_a7, "serial-a7", &s->iomem,
	392	0, 0x28);
	393	memory_region_add_subregion(sysmem, A7ADDR(base), &s->iomem_a7);
2f062c72 TS	394
	395	s->chr = chr;
	396
	397	if (chr)
	398	qemu_chr_add_handlers(chr, sh_serial_can_receive1, sh_serial_receive1,
	399	sh_serial_event, s);
bf5b7423 AJ	400
	401	s->eri = eri_source;
	402	s->rxi = rxi_source;
	403	s->txi = txi_source;
	404	s->tei = tei_source;
	405	s->bri = bri_source;
2f062c72	406	}