[qemu.git] / hw / i2c / ppc4xx_i2c.c

/*
 * PPC4xx I2C controller emulation
 *
 * Copyright (c) 2007 Jocelyn Mayer
 * Copyright (c) 2012 François Revol
 * Copyright (c) 2016-2018 BALATON Zoltan
 *
 * 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 "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/log.h"
#include "cpu.h"
#include "hw/hw.h"
#include "hw/i2c/ppc4xx_i2c.h"
#include "bitbang_i2c.h"

#define PPC4xx_I2C_MEM_SIZE 18

enum {
    IIC_MDBUF = 0,
    /* IIC_SDBUF = 2, */
    IIC_LMADR = 4,
    IIC_HMADR,
    IIC_CNTL,
    IIC_MDCNTL,
    IIC_STS,
    IIC_EXTSTS,
    IIC_LSADR,
    IIC_HSADR,
    IIC_CLKDIV,
    IIC_INTRMSK,
    IIC_XFRCNT,
    IIC_XTCNTLSS,
    IIC_DIRECTCNTL
    /* IIC_INTR */
};

#define IIC_CNTL_PT         (1 << 0)
#define IIC_CNTL_READ       (1 << 1)
#define IIC_CNTL_CHT        (1 << 2)
#define IIC_CNTL_RPST       (1 << 3)
#define IIC_CNTL_AMD        (1 << 6)
#define IIC_CNTL_HMT        (1 << 7)

#define IIC_MDCNTL_EINT     (1 << 2)
#define IIC_MDCNTL_ESM      (1 << 3)
#define IIC_MDCNTL_FMDB     (1 << 6)

#define IIC_STS_PT          (1 << 0)
#define IIC_STS_IRQA        (1 << 1)
#define IIC_STS_ERR         (1 << 2)
#define IIC_STS_MDBF        (1 << 4)
#define IIC_STS_MDBS        (1 << 5)

#define IIC_EXTSTS_XFRA     (1 << 0)
#define IIC_EXTSTS_BCS_FREE (4 << 4)
#define IIC_EXTSTS_BCS_BUSY (5 << 4)

#define IIC_INTRMSK_EIMTC   (1 << 0)
#define IIC_INTRMSK_EITA    (1 << 1)
#define IIC_INTRMSK_EIIC    (1 << 2)
#define IIC_INTRMSK_EIHE    (1 << 3)

#define IIC_XTCNTLSS_SRST   (1 << 0)

#define IIC_DIRECTCNTL_SDAC (1 << 3)
#define IIC_DIRECTCNTL_SCLC (1 << 2)
#define IIC_DIRECTCNTL_MSDA (1 << 1)
#define IIC_DIRECTCNTL_MSCL (1 << 0)

static void ppc4xx_i2c_reset(DeviceState *s)
{
    PPC4xxI2CState *i2c = PPC4xx_I2C(s);

    i2c->mdidx = -1;
    memset(i2c->mdata, 0, ARRAY_SIZE(i2c->mdata));
    /* [hl][ms]addr are not affected by reset */
    i2c->cntl = 0;
    i2c->mdcntl = 0;
    i2c->sts = 0;
    i2c->extsts = IIC_EXTSTS_BCS_FREE;
    i2c->clkdiv = 0;
    i2c->intrmsk = 0;
    i2c->xfrcnt = 0;
    i2c->xtcntlss = 0;
    i2c->directcntl = 0xf; /* all non-reserved bits set */
}

static uint64_t ppc4xx_i2c_readb(void *opaque, hwaddr addr, unsigned int size)
{
    PPC4xxI2CState *i2c = PPC4xx_I2C(opaque);
    uint64_t ret;
    int i;

    switch (addr) {
    case IIC_MDBUF:
        if (i2c->mdidx < 0) {
            ret = 0xff;
            break;
        }
        ret = i2c->mdata[0];
        if (i2c->mdidx == 3) {
            i2c->sts &= ~IIC_STS_MDBF;
        } else if (i2c->mdidx == 0) {
            i2c->sts &= ~IIC_STS_MDBS;
        }
        for (i = 0; i < i2c->mdidx; i++) {
            i2c->mdata[i] = i2c->mdata[i + 1];
        }
        if (i2c->mdidx >= 0) {
            i2c->mdidx--;
        }
        break;
    case IIC_LMADR:
        ret = i2c->lmadr;
        break;
    case IIC_HMADR:
        ret = i2c->hmadr;
        break;
    case IIC_CNTL:
        ret = i2c->cntl;
        break;
    case IIC_MDCNTL:
        ret = i2c->mdcntl;
        break;
    case IIC_STS:
        ret = i2c->sts;
        break;
    case IIC_EXTSTS:
        ret = i2c_bus_busy(i2c->bus) ?
              IIC_EXTSTS_BCS_BUSY : IIC_EXTSTS_BCS_FREE;
        break;
    case IIC_LSADR:
        ret = i2c->lsadr;
        break;
    case IIC_HSADR:
        ret = i2c->hsadr;
        break;
    case IIC_CLKDIV:
        ret = i2c->clkdiv;
        break;
    case IIC_INTRMSK:
        ret = i2c->intrmsk;
        break;
    case IIC_XFRCNT:
        ret = i2c->xfrcnt;
        break;
    case IIC_XTCNTLSS:
        ret = i2c->xtcntlss;
        break;
    case IIC_DIRECTCNTL:
        ret = i2c->directcntl;
        break;
    default:
        if (addr < PPC4xx_I2C_MEM_SIZE) {
            qemu_log_mask(LOG_UNIMP, "%s: Unimplemented register 0x%"
                          HWADDR_PRIx "\n", __func__, addr);
        } else {
            qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address 0x%"
                          HWADDR_PRIx "\n", __func__, addr);
        }
        ret = 0;
        break;
    }
    return ret;
}

static void ppc4xx_i2c_writeb(void *opaque, hwaddr addr, uint64_t value,
                              unsigned int size)
{
    PPC4xxI2CState *i2c = opaque;

    switch (addr) {
    case IIC_MDBUF:
        if (i2c->mdidx >= 3) {
            break;
        }
        i2c->mdata[++i2c->mdidx] = value;
        if (i2c->mdidx == 3) {
            i2c->sts |= IIC_STS_MDBF;
        } else if (i2c->mdidx == 0) {
            i2c->sts |= IIC_STS_MDBS;
        }
        break;
    case IIC_LMADR:
        i2c->lmadr = value;
        break;
    case IIC_HMADR:
        i2c->hmadr = value;
        break;
    case IIC_CNTL:
        i2c->cntl = value & ~IIC_CNTL_PT;
        if (value & IIC_CNTL_AMD) {
            qemu_log_mask(LOG_UNIMP, "%s: only 7 bit addresses supported\n",
                          __func__);
        }
        if (value & IIC_CNTL_HMT && i2c_bus_busy(i2c->bus)) {
            i2c_end_transfer(i2c->bus);
            if (i2c->mdcntl & IIC_MDCNTL_EINT &&
                i2c->intrmsk & IIC_INTRMSK_EIHE) {
                i2c->sts |= IIC_STS_IRQA;
                qemu_irq_raise(i2c->irq);
            }
        } else if (value & IIC_CNTL_PT) {
            int recv = (value & IIC_CNTL_READ) >> 1;
            int tct = value >> 4 & 3;
            int i;

            if (recv && (i2c->lmadr >> 1) >= 0x50 && (i2c->lmadr >> 1) < 0x58) {
                /* smbus emulation does not like multi byte reads w/o restart */
                value |= IIC_CNTL_RPST;
            }

            for (i = 0; i <= tct; i++) {
                if (!i2c_bus_busy(i2c->bus)) {
                    i2c->extsts = IIC_EXTSTS_BCS_FREE;
                    if (i2c_start_transfer(i2c->bus, i2c->lmadr >> 1, recv)) {
                        i2c->sts |= IIC_STS_ERR;
                        i2c->extsts |= IIC_EXTSTS_XFRA;
                        break;
                    } else {
                        i2c->sts &= ~IIC_STS_ERR;
                    }
                }
                if (!(i2c->sts & IIC_STS_ERR) &&
                    i2c_send_recv(i2c->bus, &i2c->mdata[i], !recv)) {
                    i2c->sts |= IIC_STS_ERR;
                    i2c->extsts |= IIC_EXTSTS_XFRA;
                    break;
                }
                if (value & IIC_CNTL_RPST || !(value & IIC_CNTL_CHT)) {
                    i2c_end_transfer(i2c->bus);
                }
            }
            i2c->xfrcnt = i;
            i2c->mdidx = i - 1;
            if (recv && i2c->mdidx >= 0) {
                i2c->sts |= IIC_STS_MDBS;
            }
            if (recv && i2c->mdidx == 3) {
                i2c->sts |= IIC_STS_MDBF;
            }
            if (i && i2c->mdcntl & IIC_MDCNTL_EINT &&
                i2c->intrmsk & IIC_INTRMSK_EIMTC) {
                i2c->sts |= IIC_STS_IRQA;
                qemu_irq_raise(i2c->irq);
            }
        }
        break;
    case IIC_MDCNTL:
        i2c->mdcntl = value & 0x3d;
        if (value & IIC_MDCNTL_ESM) {
            qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
                          __func__);
        }
        if (value & IIC_MDCNTL_FMDB) {
            i2c->mdidx = -1;
            memset(i2c->mdata, 0, ARRAY_SIZE(i2c->mdata));
            i2c->sts &= ~(IIC_STS_MDBF | IIC_STS_MDBS);
        }
        break;
    case IIC_STS:
        i2c->sts &= ~(value & 0x0a);
        if (value & IIC_STS_IRQA && i2c->mdcntl & IIC_MDCNTL_EINT) {
            qemu_irq_lower(i2c->irq);
        }
        break;
    case IIC_EXTSTS:
        i2c->extsts &= ~(value & 0x8f);
        break;
    case IIC_LSADR:
        i2c->lsadr = value;
        break;
    case IIC_HSADR:
        i2c->hsadr = value;
        break;
    case IIC_CLKDIV:
        i2c->clkdiv = value;
        break;
    case IIC_INTRMSK:
        i2c->intrmsk = value;
        break;
    case IIC_XFRCNT:
        i2c->xfrcnt = value & 0x77;
        break;
    case IIC_XTCNTLSS:
        i2c->xtcntlss &= ~(value & 0xf0);
        if (value & IIC_XTCNTLSS_SRST) {
            /* Is it actually a full reset? U-Boot sets some regs before */
            ppc4xx_i2c_reset(DEVICE(i2c));
            break;
        }
        break;
    case IIC_DIRECTCNTL:
        i2c->directcntl = value & (IIC_DIRECTCNTL_SDAC & IIC_DIRECTCNTL_SCLC);
        i2c->directcntl |= (value & IIC_DIRECTCNTL_SCLC ? 1 : 0);
        bitbang_i2c_set(i2c->bitbang, BITBANG_I2C_SCL,
                        i2c->directcntl & IIC_DIRECTCNTL_MSCL);
        i2c->directcntl |= bitbang_i2c_set(i2c->bitbang, BITBANG_I2C_SDA,
                               (value & IIC_DIRECTCNTL_SDAC) != 0) << 1;
        break;
    default:
        if (addr < PPC4xx_I2C_MEM_SIZE) {
            qemu_log_mask(LOG_UNIMP, "%s: Unimplemented register 0x%"
                          HWADDR_PRIx "\n", __func__, addr);
        } else {
            qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address 0x%"
                          HWADDR_PRIx "\n", __func__, addr);
        }
        break;
    }
}

static const MemoryRegionOps ppc4xx_i2c_ops = {
    .read = ppc4xx_i2c_readb,
    .write = ppc4xx_i2c_writeb,
    .valid.min_access_size = 1,
    .valid.max_access_size = 4,
    .impl.min_access_size = 1,
    .impl.max_access_size = 1,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static void ppc4xx_i2c_init(Object *o)
{
    PPC4xxI2CState *s = PPC4xx_I2C(o);

    memory_region_init_io(&s->iomem, OBJECT(s), &ppc4xx_i2c_ops, s,
                          TYPE_PPC4xx_I2C, PPC4xx_I2C_MEM_SIZE);
    sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
    sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
    s->bus = i2c_init_bus(DEVICE(s), "i2c");
    s->bitbang = bitbang_i2c_init(s->bus);
}

static void ppc4xx_i2c_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);

    dc->reset = ppc4xx_i2c_reset;
}

static const TypeInfo ppc4xx_i2c_type_info = {
    .name = TYPE_PPC4xx_I2C,
    .parent = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(PPC4xxI2CState),
    .instance_init = ppc4xx_i2c_init,
    .class_init = ppc4xx_i2c_class_init,
};

static void ppc4xx_i2c_register_types(void)
{
    type_register_static(&ppc4xx_i2c_type_info);
}

type_init(ppc4xx_i2c_register_types)
Commit	Line	Data
65ca801b BZ	1	/*
	2	* PPC4xx I2C controller emulation
	3	*
	4	* Copyright (c) 2007 Jocelyn Mayer
7709dbf1	5	* Copyright (c) 2012 François Revol
39aeba6c	6	* Copyright (c) 2016-2018 BALATON Zoltan
65ca801b BZ	7	*
	8	* Permission is hereby granted, free of charge, to any person obtaining a copy
	9	* of this software and associated documentation files (the "Software"), to deal
	10	* in the Software without restriction, including without limitation the rights
	11	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	12	* copies of the Software, and to permit persons to whom the Software is
	13	* furnished to do so, subject to the following conditions:
	14	*
	15	* The above copyright notice and this permission notice shall be included in
	16	* all copies or substantial portions of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	21	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	22	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	23	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	24	* THE SOFTWARE.
	25	*/
	26
	27	#include "qemu/osdep.h"
65ca801b	28	#include "qemu-common.h"
7709dbf1	29	#include "qemu/log.h"
65ca801b BZ	30	#include "cpu.h"
65ca801b BZ	31	#include "hw/hw.h"
3b09bb0f	32	#include "hw/i2c/ppc4xx_i2c.h"
ef9173a5	33	#include "bitbang_i2c.h"
65ca801b	34
42a907e8	35	#define PPC4xx_I2C_MEM_SIZE 18
65ca801b	36
afb6e204 BZ	37	enum {
	38	IIC_MDBUF = 0,
	39	/* IIC_SDBUF = 2, */
	40	IIC_LMADR = 4,
	41	IIC_HMADR,
	42	IIC_CNTL,
	43	IIC_MDCNTL,
	44	IIC_STS,
	45	IIC_EXTSTS,
	46	IIC_LSADR,
	47	IIC_HSADR,
	48	IIC_CLKDIV,
	49	IIC_INTRMSK,
	50	IIC_XFRCNT,
	51	IIC_XTCNTLSS,
	52	IIC_DIRECTCNTL
	53	/* IIC_INTR */
	54	};
	55
7709dbf1 BZ	56	#define IIC_CNTL_PT (1 << 0)
	57	#define IIC_CNTL_READ (1 << 1)
	58	#define IIC_CNTL_CHT (1 << 2)
	59	#define IIC_CNTL_RPST (1 << 3)
afb6e204 BZ	60	#define IIC_CNTL_AMD (1 << 6)
	61	#define IIC_CNTL_HMT (1 << 7)
	62
	63	#define IIC_MDCNTL_EINT (1 << 2)
	64	#define IIC_MDCNTL_ESM (1 << 3)
	65	#define IIC_MDCNTL_FMDB (1 << 6)
7709dbf1 BZ	66
7709dbf1 BZ	67	#define IIC_STS_PT (1 << 0)
afb6e204	68	#define IIC_STS_IRQA (1 << 1)
7709dbf1	69	#define IIC_STS_ERR (1 << 2)
afb6e204	70	#define IIC_STS_MDBF (1 << 4)
7709dbf1 BZ	71	#define IIC_STS_MDBS (1 << 5)
	72
	73	#define IIC_EXTSTS_XFRA (1 << 0)
afb6e204 BZ	74	#define IIC_EXTSTS_BCS_FREE (4 << 4)
	75	#define IIC_EXTSTS_BCS_BUSY (5 << 4)
	76
	77	#define IIC_INTRMSK_EIMTC (1 << 0)
	78	#define IIC_INTRMSK_EITA (1 << 1)
	79	#define IIC_INTRMSK_EIIC (1 << 2)
	80	#define IIC_INTRMSK_EIHE (1 << 3)
7709dbf1 BZ	81
	82	#define IIC_XTCNTLSS_SRST (1 << 0)
	83
ef9173a5 BZ	84	#define IIC_DIRECTCNTL_SDAC (1 << 3)
	85	#define IIC_DIRECTCNTL_SCLC (1 << 2)
	86	#define IIC_DIRECTCNTL_MSDA (1 << 1)
	87	#define IIC_DIRECTCNTL_MSCL (1 << 0)
	88
7709dbf1 BZ	89	static void ppc4xx_i2c_reset(DeviceState *s)
	90	{
	91	PPC4xxI2CState *i2c = PPC4xx_I2C(s);
	92
afb6e204 BZ	93	i2c->mdidx = -1;
	94	memset(i2c->mdata, 0, ARRAY_SIZE(i2c->mdata));
	95	/* [hl][ms]addr are not affected by reset */
7709dbf1 BZ	96	i2c->cntl = 0;
	97	i2c->mdcntl = 0;
	98	i2c->sts = 0;
afb6e204	99	i2c->extsts = IIC_EXTSTS_BCS_FREE;
7709dbf1 BZ	100	i2c->clkdiv = 0;
	101	i2c->intrmsk = 0;
	102	i2c->xfrcnt = 0;
	103	i2c->xtcntlss = 0;
afb6e204	104	i2c->directcntl = 0xf; /* all non-reserved bits set */
7709dbf1	105	}
65ca801b	106
3b09bb0f	107	static uint64_t ppc4xx_i2c_readb(void *opaque, hwaddr addr, unsigned int size)
65ca801b	108	{
3b09bb0f BZ	109	PPC4xxI2CState *i2c = PPC4xx_I2C(opaque);
3b09bb0f BZ	110	uint64_t ret;
afb6e204	111	int i;
65ca801b	112
65ca801b	113	switch (addr) {
afb6e204 BZ	114	case IIC_MDBUF:
afb6e204 BZ	115	if (i2c->mdidx < 0) {
7709dbf1	116	ret = 0xff;
afb6e204 BZ	117	break;
	118	}
	119	ret = i2c->mdata[0];
	120	if (i2c->mdidx == 3) {
	121	i2c->sts &= ~IIC_STS_MDBF;
	122	} else if (i2c->mdidx == 0) {
	123	i2c->sts &= ~IIC_STS_MDBS;
	124	}
	125	for (i = 0; i < i2c->mdidx; i++) {
	126	i2c->mdata[i] = i2c->mdata[i + 1];
	127	}
	128	if (i2c->mdidx >= 0) {
	129	i2c->mdidx--;
7709dbf1	130	}
65ca801b	131	break;
afb6e204	132	case IIC_LMADR:
65ca801b BZ	133	ret = i2c->lmadr;
65ca801b BZ	134	break;
afb6e204	135	case IIC_HMADR:
65ca801b BZ	136	ret = i2c->hmadr;
65ca801b BZ	137	break;
afb6e204	138	case IIC_CNTL:
65ca801b BZ	139	ret = i2c->cntl;
65ca801b BZ	140	break;
afb6e204	141	case IIC_MDCNTL:
65ca801b BZ	142	ret = i2c->mdcntl;
65ca801b BZ	143	break;
afb6e204	144	case IIC_STS:
65ca801b BZ	145	ret = i2c->sts;
65ca801b BZ	146	break;
afb6e204 BZ	147	case IIC_EXTSTS:
	148	ret = i2c_bus_busy(i2c->bus) ?
	149	IIC_EXTSTS_BCS_BUSY : IIC_EXTSTS_BCS_FREE;
65ca801b	150	break;
afb6e204	151	case IIC_LSADR:
65ca801b BZ	152	ret = i2c->lsadr;
65ca801b BZ	153	break;
afb6e204	154	case IIC_HSADR:
65ca801b BZ	155	ret = i2c->hsadr;
65ca801b BZ	156	break;
afb6e204	157	case IIC_CLKDIV:
65ca801b BZ	158	ret = i2c->clkdiv;
65ca801b BZ	159	break;
afb6e204	160	case IIC_INTRMSK:
65ca801b BZ	161	ret = i2c->intrmsk;
65ca801b BZ	162	break;
afb6e204	163	case IIC_XFRCNT:
65ca801b BZ	164	ret = i2c->xfrcnt;
65ca801b BZ	165	break;
afb6e204	166	case IIC_XTCNTLSS:
65ca801b BZ	167	ret = i2c->xtcntlss;
65ca801b BZ	168	break;
afb6e204	169	case IIC_DIRECTCNTL:
65ca801b BZ	170	ret = i2c->directcntl;
	171	break;
	172	default:
42a907e8 BZ	173	if (addr < PPC4xx_I2C_MEM_SIZE) {
	174	qemu_log_mask(LOG_UNIMP, "%s: Unimplemented register 0x%"
	175	HWADDR_PRIx "\n", __func__, addr);
	176	} else {
	177	qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address 0x%"
	178	HWADDR_PRIx "\n", __func__, addr);
	179	}
7709dbf1	180	ret = 0;
65ca801b BZ	181	break;
65ca801b BZ	182	}
65ca801b BZ	183	return ret;
	184	}
	185
3b09bb0f BZ	186	static void ppc4xx_i2c_writeb(void *opaque, hwaddr addr, uint64_t value,
3b09bb0f BZ	187	unsigned int size)
65ca801b	188	{
3b09bb0f	189	PPC4xxI2CState *i2c = opaque;
7709dbf1	190
65ca801b	191	switch (addr) {
afb6e204 BZ	192	case IIC_MDBUF:
	193	if (i2c->mdidx >= 3) {
	194	break;
7709dbf1	195	}
afb6e204 BZ	196	i2c->mdata[++i2c->mdidx] = value;
	197	if (i2c->mdidx == 3) {
	198	i2c->sts \|= IIC_STS_MDBF;
	199	} else if (i2c->mdidx == 0) {
	200	i2c->sts \|= IIC_STS_MDBS;
7709dbf1	201	}
65ca801b	202	break;
afb6e204	203	case IIC_LMADR:
65ca801b BZ	204	i2c->lmadr = value;
65ca801b BZ	205	break;
afb6e204	206	case IIC_HMADR:
65ca801b BZ	207	i2c->hmadr = value;
65ca801b BZ	208	break;
afb6e204 BZ	209	case IIC_CNTL:
	210	i2c->cntl = value & ~IIC_CNTL_PT;
	211	if (value & IIC_CNTL_AMD) {
	212	qemu_log_mask(LOG_UNIMP, "%s: only 7 bit addresses supported\n",
	213	__func__);
	214	}
	215	if (value & IIC_CNTL_HMT && i2c_bus_busy(i2c->bus)) {
	216	i2c_end_transfer(i2c->bus);
	217	if (i2c->mdcntl & IIC_MDCNTL_EINT &&
	218	i2c->intrmsk & IIC_INTRMSK_EIHE) {
	219	i2c->sts \|= IIC_STS_IRQA;
	220	qemu_irq_raise(i2c->irq);
	221	}
	222	} else if (value & IIC_CNTL_PT) {
	223	int recv = (value & IIC_CNTL_READ) >> 1;
	224	int tct = value >> 4 & 3;
	225	int i;
	226
	227	if (recv && (i2c->lmadr >> 1) >= 0x50 && (i2c->lmadr >> 1) < 0x58) {
	228	/* smbus emulation does not like multi byte reads w/o restart */
	229	value \|= IIC_CNTL_RPST;
	230	}
	231
	232	for (i = 0; i <= tct; i++) {
	233	if (!i2c_bus_busy(i2c->bus)) {
	234	i2c->extsts = IIC_EXTSTS_BCS_FREE;
	235	if (i2c_start_transfer(i2c->bus, i2c->lmadr >> 1, recv)) {
	236	i2c->sts \|= IIC_STS_ERR;
	237	i2c->extsts \|= IIC_EXTSTS_XFRA;
	238	break;
	239	} else {
	240	i2c->sts &= ~IIC_STS_ERR;
	241	}
7709dbf1	242	}
afb6e204 BZ	243	if (!(i2c->sts & IIC_STS_ERR) &&
afb6e204 BZ	244	i2c_send_recv(i2c->bus, &i2c->mdata[i], !recv)) {
7709dbf1 BZ	245	i2c->sts \|= IIC_STS_ERR;
7709dbf1 BZ	246	i2c->extsts \|= IIC_EXTSTS_XFRA;
afb6e204 BZ	247	break;
	248	}
	249	if (value & IIC_CNTL_RPST \|\| !(value & IIC_CNTL_CHT)) {
	250	i2c_end_transfer(i2c->bus);
7709dbf1	251	}
afb6e204 BZ	252	}
	253	i2c->xfrcnt = i;
	254	i2c->mdidx = i - 1;
	255	if (recv && i2c->mdidx >= 0) {
	256	i2c->sts \|= IIC_STS_MDBS;
	257	}
	258	if (recv && i2c->mdidx == 3) {
	259	i2c->sts \|= IIC_STS_MDBF;
	260	}
	261	if (i && i2c->mdcntl & IIC_MDCNTL_EINT &&
	262	i2c->intrmsk & IIC_INTRMSK_EIMTC) {
	263	i2c->sts \|= IIC_STS_IRQA;
	264	qemu_irq_raise(i2c->irq);
7709dbf1 BZ	265	}
7709dbf1 BZ	266	}
65ca801b	267	break;
afb6e204 BZ	268	case IIC_MDCNTL:
	269	i2c->mdcntl = value & 0x3d;
	270	if (value & IIC_MDCNTL_ESM) {
	271	qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
	272	__func__);
	273	}
	274	if (value & IIC_MDCNTL_FMDB) {
	275	i2c->mdidx = -1;
	276	memset(i2c->mdata, 0, ARRAY_SIZE(i2c->mdata));
	277	i2c->sts &= ~(IIC_STS_MDBF \| IIC_STS_MDBS);
	278	}
65ca801b	279	break;
afb6e204 BZ	280	case IIC_STS:
	281	i2c->sts &= ~(value & 0x0a);
	282	if (value & IIC_STS_IRQA && i2c->mdcntl & IIC_MDCNTL_EINT) {
	283	qemu_irq_lower(i2c->irq);
	284	}
65ca801b	285	break;
afb6e204	286	case IIC_EXTSTS:
42a907e8	287	i2c->extsts &= ~(value & 0x8f);
65ca801b	288	break;
afb6e204	289	case IIC_LSADR:
65ca801b BZ	290	i2c->lsadr = value;
65ca801b BZ	291	break;
afb6e204	292	case IIC_HSADR:
65ca801b BZ	293	i2c->hsadr = value;
65ca801b BZ	294	break;
afb6e204	295	case IIC_CLKDIV:
65ca801b BZ	296	i2c->clkdiv = value;
65ca801b BZ	297	break;
afb6e204	298	case IIC_INTRMSK:
65ca801b BZ	299	i2c->intrmsk = value;
65ca801b BZ	300	break;
afb6e204	301	case IIC_XFRCNT:
65ca801b BZ	302	i2c->xfrcnt = value & 0x77;
65ca801b BZ	303	break;
afb6e204 BZ	304	case IIC_XTCNTLSS:
afb6e204 BZ	305	i2c->xtcntlss &= ~(value & 0xf0);
7709dbf1 BZ	306	if (value & IIC_XTCNTLSS_SRST) {
	307	/* Is it actually a full reset? U-Boot sets some regs before */
	308	ppc4xx_i2c_reset(DEVICE(i2c));
	309	break;
	310	}
65ca801b	311	break;
afb6e204	312	case IIC_DIRECTCNTL:
ef9173a5 BZ	313	i2c->directcntl = value & (IIC_DIRECTCNTL_SDAC & IIC_DIRECTCNTL_SCLC);
	314	i2c->directcntl \|= (value & IIC_DIRECTCNTL_SCLC ? 1 : 0);
	315	bitbang_i2c_set(i2c->bitbang, BITBANG_I2C_SCL,
	316	i2c->directcntl & IIC_DIRECTCNTL_MSCL);
	317	i2c->directcntl \|= bitbang_i2c_set(i2c->bitbang, BITBANG_I2C_SDA,
	318	(value & IIC_DIRECTCNTL_SDAC) != 0) << 1;
65ca801b	319	break;
7709dbf1	320	default:
42a907e8 BZ	321	if (addr < PPC4xx_I2C_MEM_SIZE) {
	322	qemu_log_mask(LOG_UNIMP, "%s: Unimplemented register 0x%"
	323	HWADDR_PRIx "\n", __func__, addr);
	324	} else {
	325	qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad address 0x%"
	326	HWADDR_PRIx "\n", __func__, addr);
	327	}
7709dbf1	328	break;
65ca801b BZ	329	}
	330	}
	331
3b09bb0f BZ	332	static const MemoryRegionOps ppc4xx_i2c_ops = {
	333	.read = ppc4xx_i2c_readb,
	334	.write = ppc4xx_i2c_writeb,
	335	.valid.min_access_size = 1,
	336	.valid.max_access_size = 4,
	337	.impl.min_access_size = 1,
	338	.impl.max_access_size = 1,
65ca801b BZ	339	.endianness = DEVICE_NATIVE_ENDIAN,
	340	};
	341
3b09bb0f	342	static void ppc4xx_i2c_init(Object *o)
65ca801b	343	{
3b09bb0f	344	PPC4xxI2CState *s = PPC4xx_I2C(o);
65ca801b	345
3b09bb0f BZ	346	memory_region_init_io(&s->iomem, OBJECT(s), &ppc4xx_i2c_ops, s,
	347	TYPE_PPC4xx_I2C, PPC4xx_I2C_MEM_SIZE);
	348	sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
	349	sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
	350	s->bus = i2c_init_bus(DEVICE(s), "i2c");
ef9173a5	351	s->bitbang = bitbang_i2c_init(s->bus);
65ca801b	352	}
3b09bb0f BZ	353
	354	static void ppc4xx_i2c_class_init(ObjectClass klass, void data)
	355	{
	356	DeviceClass *dc = DEVICE_CLASS(klass);
	357
	358	dc->reset = ppc4xx_i2c_reset;
	359	}
	360
	361	static const TypeInfo ppc4xx_i2c_type_info = {
	362	.name = TYPE_PPC4xx_I2C,
	363	.parent = TYPE_SYS_BUS_DEVICE,
	364	.instance_size = sizeof(PPC4xxI2CState),
	365	.instance_init = ppc4xx_i2c_init,
	366	.class_init = ppc4xx_i2c_class_init,
	367	};
	368
	369	static void ppc4xx_i2c_register_types(void)
	370	{
	371	type_register_static(&ppc4xx_i2c_type_info);
	372	}
	373
	374	type_init(ppc4xx_i2c_register_types)