[mirror_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 <assert.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)

typedef struct {
    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[16]; /* frdr / rdr */
    uint8_t rx_cnt;

    target_phys_addr_t base;
    int freq;
    int feat;
    int flags;

    CharDriverState *chr;

    struct intc_source *eri;
    struct intc_source *rxi;
    struct intc_source *txi;
    struct intc_source *tei;
    struct intc_source *bri;
} sh_serial_state;

static void sh_serial_ioport_write(void *opaque, uint32_t offs, uint32_t val)
{
    sh_serial_state *s = opaque;
    unsigned char ch;

#ifdef DEBUG_SERIAL
    printf("sh_serial: write base=0x%08lx offs=0x%02x val=0x%02x\n",
	   (unsigned long) s->base, 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 */
        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) {
            if ((val & (1 << 7)) && !(s->txi->asserted))
                sh_intc_toggle_source(s->txi, 0, 1);
            else if (!(val & (1 << 7)) && s->txi->asserted)
                sh_intc_toggle_source(s->txi, 0, -1);
        }
        return;
    case 0x0c: /* FTDR / TDR */
        if (s->chr) {
            ch = val;
            qemu_chr_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;
            return;
        case 0x18: /* FCR */
            s->fcr = val;
            return;
        case 0x20: /* SPTR */
            s->sptr = val;
            return;
        case 0x24: /* LSR */
            return;
        }
    }
    else {
#if 0
        switch(offs) {
        case 0x0c:
            ret = s->dr;
            break;
        case 0x10:
            ret = 0;
            break;
        case 0x1c:
            ret = s->sptr;
            break;
        }
#endif
    }

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

static uint32_t sh_serial_ioport_read(void *opaque, uint32_t offs)
{
    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;
#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 {
#if 0
        switch(offs) {
        case 0x0c:
            ret = s->dr;
            break;
        case 0x10:
            ret = 0;
            break;
        case 0x1c:
            ret = s->sptr;
            break;
        }
#endif
    }
#ifdef DEBUG_SERIAL
    printf("sh_serial: read base=0x%08lx offs=0x%02x val=0x%x\n",
	   (unsigned long) s->base, offs, ret);
#endif

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

    return ret;
}

static int sh_serial_can_receive(sh_serial_state *s)
{
    return 0;
}

static void sh_serial_receive_byte(sh_serial_state *s, int ch)
{
}

static void sh_serial_receive_break(sh_serial_state *s)
{
}

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;
    sh_serial_receive_byte(s, 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 uint32_t sh_serial_read (void *opaque, target_phys_addr_t addr)
{
    sh_serial_state *s = opaque;
    return sh_serial_ioport_read(s, addr - s->base);
}

static void sh_serial_write (void *opaque,
                             target_phys_addr_t addr, uint32_t value)
{
    sh_serial_state *s = opaque;
    sh_serial_ioport_write(s, addr - s->base, value);
}

static CPUReadMemoryFunc *sh_serial_readfn[] = {
    &sh_serial_read,
    &sh_serial_read,
    &sh_serial_read,
};

static CPUWriteMemoryFunc *sh_serial_writefn[] = {
    &sh_serial_write,
    &sh_serial_write,
    &sh_serial_write,
};

void sh_serial_init (target_phys_addr_t base, int feat,
		     uint32_t freq, CharDriverState *chr,
		     struct intc_source *eri_source,
		     struct intc_source *rxi_source,
		     struct intc_source *txi_source,
		     struct intc_source *tei_source,
		     struct intc_source *bri_source)
{
    sh_serial_state *s;
    int s_io_memory;

    s = qemu_mallocz(sizeof(sh_serial_state));
    if (!s)
        return;

    s->base = base;
    s->feat = feat;
    s->flags = SH_SERIAL_FLAG_TEND | SH_SERIAL_FLAG_TDE;

    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;
    }

    s->rx_cnt = 0;

    s_io_memory = cpu_register_io_memory(0, sh_serial_readfn,
					 sh_serial_writefn, s);
    cpu_register_physical_memory(base, 0x28, s_io_memory);

    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"
2f062c72 TS	30	#include <assert.h>
	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
	40	typedef struct {
	41	uint8_t smr;
	42	uint8_t brr;
	43	uint8_t scr;
	44	uint8_t dr; /* ftdr / tdr */
	45	uint8_t sr; /* fsr / ssr */
	46	uint16_t fcr;
	47	uint8_t sptr;
	48
	49	uint8_t rx_fifo[16]; /* frdr / rdr */
	50	uint8_t rx_cnt;
	51
	52	target_phys_addr_t base;
	53	int freq;
	54	int feat;
	55	int flags;
	56
	57	CharDriverState *chr;
bf5b7423 AJ	58
	59	struct intc_source *eri;
	60	struct intc_source *rxi;
	61	struct intc_source *txi;
	62	struct intc_source *tei;
	63	struct intc_source *bri;
2f062c72 TS	64	} sh_serial_state;
	65
	66	static void sh_serial_ioport_write(void *opaque, uint32_t offs, uint32_t val)
	67	{
	68	sh_serial_state *s = opaque;
	69	unsigned char ch;
	70
	71	#ifdef DEBUG_SERIAL
	72	printf("sh_serial: write base=0x%08lx offs=0x%02x val=0x%02x\n",
	73	(unsigned long) s->base, offs, val);
	74	#endif
	75	switch(offs) {
	76	case 0x00: /* SMR */
	77	s->smr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0x7b : 0xff);
	78	return;
	79	case 0x04: /* BRR */
	80	s->brr = val;
	81	return;
	82	case 0x08: /* SCR */
bf5b7423	83	s->scr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0xfa : 0xff);
2f062c72 TS	84	if (!(val & (1 << 5)))
2f062c72 TS	85	s->flags \|= SH_SERIAL_FLAG_TEND;
bf5b7423 AJ	86	if ((s->feat & SH_SERIAL_FEAT_SCIF) && s->txi) {
	87	if ((val & (1 << 7)) && !(s->txi->asserted))
	88	sh_intc_toggle_source(s->txi, 0, 1);
	89	else if (!(val & (1 << 7)) && s->txi->asserted)
	90	sh_intc_toggle_source(s->txi, 0, -1);
	91	}
2f062c72 TS	92	return;
	93	case 0x0c: /* FTDR / TDR */
	94	if (s->chr) {
	95	ch = val;
	96	qemu_chr_write(s->chr, &ch, 1);
	97	}
	98	s->dr = val;
	99	s->flags &= ~SH_SERIAL_FLAG_TDE;
	100	return;
	101	#if 0
	102	case 0x14: /* FRDR / RDR */
	103	ret = 0;
	104	break;
	105	#endif
	106	}
	107	if (s->feat & SH_SERIAL_FEAT_SCIF) {
	108	switch(offs) {
	109	case 0x10: /* FSR */
	110	if (!(val & (1 << 6)))
	111	s->flags &= ~SH_SERIAL_FLAG_TEND;
	112	if (!(val & (1 << 5)))
	113	s->flags &= ~SH_SERIAL_FLAG_TDE;
	114	if (!(val & (1 << 4)))
	115	s->flags &= ~SH_SERIAL_FLAG_BRK;
	116	if (!(val & (1 << 1)))
	117	s->flags &= ~SH_SERIAL_FLAG_RDF;
	118	if (!(val & (1 << 0)))
	119	s->flags &= ~SH_SERIAL_FLAG_DR;
	120	return;
	121	case 0x18: /* FCR */
	122	s->fcr = val;
	123	return;
	124	case 0x20: /* SPTR */
	125	s->sptr = val;
	126	return;
	127	case 0x24: /* LSR */
	128	return;
	129	}
	130	}
	131	else {
	132	#if 0
	133	switch(offs) {
	134	case 0x0c:
	135	ret = s->dr;
	136	break;
	137	case 0x10:
	138	ret = 0;
	139	break;
	140	case 0x1c:
	141	ret = s->sptr;
	142	break;
	143	}
	144	#endif
	145	}
	146
	147	fprintf(stderr, "sh_serial: unsupported write to 0x%02x\n", offs);
	148	assert(0);
	149	}
	150
	151	static uint32_t sh_serial_ioport_read(void *opaque, uint32_t offs)
	152	{
	153	sh_serial_state *s = opaque;
	154	uint32_t ret = ~0;
	155
156	#if 0
157	switch(offs) {
158	case 0x00:
159	ret = s->smr;
160	break;
161	case 0x04:
162	ret = s->brr;
163	break;
164	case 0x08:
165	ret = s->scr;
166	break;
167	case 0x14:
168	ret = 0;
169	break;
170	}
171	#endif
172	if (s->feat & SH_SERIAL_FEAT_SCIF) {
173	switch(offs) {
bf5b7423 AJ	174	case 0x00: /* SMR */
	175	ret = s->smr;
	176	break;
	177	case 0x08: /* SCR */
	178	ret = s->scr;
	179	break;
2f062c72 TS	180	case 0x10: /* FSR */
	181	ret = 0;
	182	if (s->flags & SH_SERIAL_FLAG_TEND)
	183	ret \|= (1 << 6);
	184	if (s->flags & SH_SERIAL_FLAG_TDE)
	185	ret \|= (1 << 5);
	186	if (s->flags & SH_SERIAL_FLAG_BRK)
	187	ret \|= (1 << 4);
	188	if (s->flags & SH_SERIAL_FLAG_RDF)
	189	ret \|= (1 << 1);
	190	if (s->flags & SH_SERIAL_FLAG_DR)
	191	ret \|= (1 << 0);
	192
	193	if (s->scr & (1 << 5))
	194	s->flags \|= SH_SERIAL_FLAG_TDE \| SH_SERIAL_FLAG_TEND;
	195
	196	break;
	197	#if 0
	198	case 0x18:
	199	ret = s->fcr;
	200	break;
	201	#endif
	202	case 0x1c:
	203	ret = s->rx_cnt;
	204	break;
	205	case 0x20:
	206	ret = s->sptr;
	207	break;
	208	case 0x24:
	209	ret = 0;
	210	break;
	211	}
	212	}
	213	else {
	214	#if 0
	215	switch(offs) {
	216	case 0x0c:
	217	ret = s->dr;
	218	break;
	219	case 0x10:
	220	ret = 0;
	221	break;
	222	case 0x1c:
	223	ret = s->sptr;
	224	break;
	225	}
	226	#endif
	227	}
	228	#ifdef DEBUG_SERIAL
	229	printf("sh_serial: read base=0x%08lx offs=0x%02x val=0x%x\n",
	230	(unsigned long) s->base, offs, ret);
	231	#endif
	232
	233	if (ret & ~((1 << 16) - 1)) {
	234	fprintf(stderr, "sh_serial: unsupported read from 0x%02x\n", offs);
	235	assert(0);
	236	}
	237
	238	return ret;
	239	}
	240
	241	static int sh_serial_can_receive(sh_serial_state *s)
	242	{
	243	return 0;
244	}
245
246	static void sh_serial_receive_byte(sh_serial_state *s, int ch)
247	{
248	}
249
250	static void sh_serial_receive_break(sh_serial_state *s)
251	{
252	}
253
254	static int sh_serial_can_receive1(void *opaque)
255	{
256	sh_serial_state *s = opaque;
257	return sh_serial_can_receive(s);
258	}
259
260	static void sh_serial_receive1(void opaque, const uint8_t buf, int size)
261	{
262	sh_serial_state *s = opaque;
263	sh_serial_receive_byte(s, buf[0]);
264	}
265
266	static void sh_serial_event(void *opaque, int event)
267	{
268	sh_serial_state *s = opaque;
269	if (event == CHR_EVENT_BREAK)
270	sh_serial_receive_break(s);
271	}
272
9596ebb7	273	static uint32_t sh_serial_read (void *opaque, target_phys_addr_t addr)
2f062c72 TS	274	{
	275	sh_serial_state *s = opaque;
	276	return sh_serial_ioport_read(s, addr - s->base);
	277	}
	278
9596ebb7 PB	279	static void sh_serial_write (void *opaque,
9596ebb7 PB	280	target_phys_addr_t addr, uint32_t value)
2f062c72 TS	281	{
	282	sh_serial_state *s = opaque;
	283	sh_serial_ioport_write(s, addr - s->base, value);
	284	}
	285
	286	static CPUReadMemoryFunc *sh_serial_readfn[] = {
	287	&sh_serial_read,
	288	&sh_serial_read,
	289	&sh_serial_read,
	290	};
	291
	292	static CPUWriteMemoryFunc *sh_serial_writefn[] = {
	293	&sh_serial_write,
	294	&sh_serial_write,
	295	&sh_serial_write,
	296	};
	297
	298	void sh_serial_init (target_phys_addr_t base, int feat,
bf5b7423 AJ	299	uint32_t freq, CharDriverState *chr,
	300	struct intc_source *eri_source,
	301	struct intc_source *rxi_source,
	302	struct intc_source *txi_source,
	303	struct intc_source *tei_source,
	304	struct intc_source *bri_source)
2f062c72 TS	305	{
	306	sh_serial_state *s;
	307	int s_io_memory;
	308
	309	s = qemu_mallocz(sizeof(sh_serial_state));
	310	if (!s)
	311	return;
	312
	313	s->base = base;
	314	s->feat = feat;
	315	s->flags = SH_SERIAL_FLAG_TEND \| SH_SERIAL_FLAG_TDE;
	316
	317	s->smr = 0;
	318	s->brr = 0xff;
b7d35e65	319	s->scr = 1 << 5; /* pretend that TX is enabled so early printk works */
2f062c72 TS	320	s->sptr = 0;
	321
	322	if (feat & SH_SERIAL_FEAT_SCIF) {
	323	s->fcr = 0;
	324	}
	325	else {
	326	s->dr = 0xff;
	327	}
	328
	329	s->rx_cnt = 0;
	330
	331	s_io_memory = cpu_register_io_memory(0, sh_serial_readfn,
	332	sh_serial_writefn, s);
	333	cpu_register_physical_memory(base, 0x28, s_io_memory);
	334
	335	s->chr = chr;
	336
	337	if (chr)
	338	qemu_chr_add_handlers(chr, sh_serial_can_receive1, sh_serial_receive1,
	339	sh_serial_event, s);
bf5b7423 AJ	340
	341	s->eri = eri_source;
	342	s->rxi = rxi_source;
	343	s->txi = txi_source;
	344	s->tei = tei_source;
	345	s->bri = bri_source;
2f062c72	346	}