[qemu.git] / hw / eeprom93xx.c

/*
 * QEMU EEPROM 93xx emulation
 *
 * Copyright (c) 2006-2007 Stefan Weil
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

/* Emulation for serial EEPROMs:
 * NMC93C06 256-Bit (16 x 16)
 * NMC93C46 1024-Bit (64 x 16)
 * NMC93C56 2028 Bit (128 x 16)
 * NMC93C66 4096 Bit (256 x 16)
 * Compatible devices include FM93C46 and others.
 *
 * Other drivers use these interface functions:
 * eeprom93xx_new   - add a new EEPROM (with 16, 64 or 256 words)
 * eeprom93xx_free  - destroy EEPROM
 * eeprom93xx_read  - read data from the EEPROM
 * eeprom93xx_write - write data to the EEPROM
 * eeprom93xx_data  - get EEPROM data array for external manipulation
 *
 * Todo list:
 * - No emulation of EEPROM timings.
 */

#include "hw.h"
#include "eeprom93xx.h"

/* Debug EEPROM emulation. */
//~ #define DEBUG_EEPROM

#ifdef DEBUG_EEPROM
#define logout(fmt, ...) fprintf(stderr, "EEPROM\t%-24s" fmt, __func__, ## __VA_ARGS__)
#else
#define logout(fmt, ...) ((void)0)
#endif

#define EEPROM_INSTANCE  0
#define OLD_EEPROM_VERSION 20061112
#define EEPROM_VERSION (OLD_EEPROM_VERSION + 1)

#if 0
typedef enum {
  eeprom_read  = 0x80,   /* read register xx */
  eeprom_write = 0x40,   /* write register xx */
  eeprom_erase = 0xc0,   /* erase register xx */
  eeprom_ewen  = 0x30,   /* erase / write enable */
  eeprom_ewds  = 0x00,   /* erase / write disable */
  eeprom_eral  = 0x20,   /* erase all registers */
  eeprom_wral  = 0x10,   /* write all registers */
  eeprom_amask = 0x0f,
  eeprom_imask = 0xf0
} eeprom_instruction_t;
#endif

#ifdef DEBUG_EEPROM
static const char *opstring[] = {
  "extended", "write", "read", "erase"
};
#endif

struct _eeprom_t {
    uint8_t  tick;
    uint8_t  address;
    uint8_t  command;
    uint8_t  writeable;

    uint8_t eecs;
    uint8_t eesk;
    uint8_t eedo;

    uint8_t  addrbits;
    uint16_t size;
    uint16_t data;
    uint16_t contents[0];
};

/* Code for saving and restoring of EEPROM state. */

/* Restore an uint16_t from an uint8_t
   This is a Big hack, but it is how the old state did it.
 */

static int get_uint16_from_uint8(QEMUFile *f, void *pv, size_t size)
{
    uint16_t *v = pv;
    *v = qemu_get_ubyte(f);
    return 0;
}

static void put_unused(QEMUFile *f, void *pv, size_t size)
{
    fprintf(stderr, "uint16_from_uint8 is used only for backwards compatibility.\n");
    fprintf(stderr, "Never should be used to write a new state.\n");
    exit(0);
}

static const VMStateInfo vmstate_hack_uint16_from_uint8 = {
    .name = "uint16_from_uint8",
    .get  = get_uint16_from_uint8,
    .put  = put_unused,
};

#define VMSTATE_UINT16_HACK_TEST(_f, _s, _t)                           \
    VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint16_from_uint8, uint16_t)

static bool is_old_eeprom_version(void *opaque, int version_id)
{
    return version_id == OLD_EEPROM_VERSION;
}

static const VMStateDescription vmstate_eeprom = {
    .name = "eeprom",
    .version_id = EEPROM_VERSION,
    .minimum_version_id = OLD_EEPROM_VERSION,
    .minimum_version_id_old = OLD_EEPROM_VERSION,
    .fields      = (VMStateField []) {
        VMSTATE_UINT8(tick, eeprom_t),
        VMSTATE_UINT8(address, eeprom_t),
        VMSTATE_UINT8(command, eeprom_t),
        VMSTATE_UINT8(writeable, eeprom_t),

        VMSTATE_UINT8(eecs, eeprom_t),
        VMSTATE_UINT8(eesk, eeprom_t),
        VMSTATE_UINT8(eedo, eeprom_t),

        VMSTATE_UINT8(addrbits, eeprom_t),
        VMSTATE_UINT16_HACK_TEST(size, eeprom_t, is_old_eeprom_version),
        VMSTATE_UNUSED_TEST(is_old_eeprom_version, 1),
        VMSTATE_UINT16_EQUAL_V(size, eeprom_t, EEPROM_VERSION),
        VMSTATE_UINT16(data, eeprom_t),
        VMSTATE_VARRAY_UINT16_UNSAFE(contents, eeprom_t, size, 0,
                                     vmstate_info_uint16, uint16_t),
        VMSTATE_END_OF_LIST()
    }
};

void eeprom93xx_write(eeprom_t *eeprom, int eecs, int eesk, int eedi)
{
    uint8_t tick = eeprom->tick;
    uint8_t eedo = eeprom->eedo;
    uint16_t address = eeprom->address;
    uint8_t command = eeprom->command;

    logout("CS=%u SK=%u DI=%u DO=%u, tick = %u\n",
           eecs, eesk, eedi, eedo, tick);

    if (! eeprom->eecs && eecs) {
        /* Start chip select cycle. */
        logout("Cycle start, waiting for 1st start bit (0)\n");
        tick = 0;
        command = 0x0;
        address = 0x0;
    } else if (eeprom->eecs && ! eecs) {
        /* End chip select cycle. This triggers write / erase. */
        if (eeprom->writeable) {
            uint8_t subcommand = address >> (eeprom->addrbits - 2);
            if (command == 0 && subcommand == 2) {
                /* Erase all. */
                for (address = 0; address < eeprom->size; address++) {
                    eeprom->contents[address] = 0xffff;
                }
            } else if (command == 3) {
                /* Erase word. */
                eeprom->contents[address] = 0xffff;
            } else if (tick >= 2 + 2 + eeprom->addrbits + 16) {
                if (command == 1) {
                    /* Write word. */
                    eeprom->contents[address] &= eeprom->data;
                } else if (command == 0 && subcommand == 1) {
                    /* Write all. */
                    for (address = 0; address < eeprom->size; address++) {
                        eeprom->contents[address] &= eeprom->data;
                    }
                }
            }
        }
        /* Output DO is tristate, read results in 1. */
        eedo = 1;
    } else if (eecs && ! eeprom->eesk && eesk) {
        /* Raising edge of clock shifts data in. */
        if (tick == 0) {
            /* Wait for 1st start bit. */
            if (eedi == 0) {
                logout("Got correct 1st start bit, waiting for 2nd start bit (1)\n");
                tick++;
            } else {
                logout("wrong 1st start bit (is 1, should be 0)\n");
                tick = 2;
                //~ assert(!"wrong start bit");
            }
        } else if (tick == 1) {
            /* Wait for 2nd start bit. */
            if (eedi != 0) {
                logout("Got correct 2nd start bit, getting command + address\n");
                tick++;
            } else {
                logout("1st start bit is longer than needed\n");
            }
        } else if (tick < 2 + 2) {
            /* Got 2 start bits, transfer 2 opcode bits. */
            tick++;
            command <<= 1;
            if (eedi) {
                command += 1;
            }
        } else if (tick < 2 + 2 + eeprom->addrbits) {
            /* Got 2 start bits and 2 opcode bits, transfer all address bits. */
            tick++;
            address = ((address << 1) | eedi);
            if (tick == 2 + 2 + eeprom->addrbits) {
                logout("%s command, address = 0x%02x (value 0x%04x)\n",
                       opstring[command], address, eeprom->contents[address]);
                if (command == 2) {
                    eedo = 0;
                }
                address = address % eeprom->size;
                if (command == 0) {
                    /* Command code in upper 2 bits of address. */
                    switch (address >> (eeprom->addrbits - 2)) {
                        case 0:
                            logout("write disable command\n");
                            eeprom->writeable = 0;
                            break;
                        case 1:
                            logout("write all command\n");
                            break;
                        case 2:
                            logout("erase all command\n");
                            break;
                        case 3:
                            logout("write enable command\n");
                            eeprom->writeable = 1;
                            break;
                    }
                } else {
                    /* Read, write or erase word. */
                    eeprom->data = eeprom->contents[address];
                }
            }
        } else if (tick < 2 + 2 + eeprom->addrbits + 16) {
            /* Transfer 16 data bits. */
            tick++;
            if (command == 2) {
                /* Read word. */
                eedo = ((eeprom->data & 0x8000) != 0);
            }
            eeprom->data <<= 1;
            eeprom->data += eedi;
        } else {
            logout("additional unneeded tick, not processed\n");
        }
    }
    /* Save status of EEPROM. */
    eeprom->tick = tick;
    eeprom->eecs = eecs;
    eeprom->eesk = eesk;
    eeprom->eedo = eedo;
    eeprom->address = address;
    eeprom->command = command;
}

uint16_t eeprom93xx_read(eeprom_t *eeprom)
{
    /* Return status of pin DO (0 or 1). */
    logout("CS=%u DO=%u\n", eeprom->eecs, eeprom->eedo);
    return (eeprom->eedo);
}

#if 0
void eeprom93xx_reset(eeprom_t *eeprom)
{
    /* prepare eeprom */
    logout("eeprom = 0x%p\n", eeprom);
    eeprom->tick = 0;
    eeprom->command = 0;
}
#endif

eeprom_t *eeprom93xx_new(DeviceState *dev, uint16_t nwords)
{
    /* Add a new EEPROM (with 16, 64 or 256 words). */
    eeprom_t *eeprom;
    uint8_t addrbits;

    switch (nwords) {
        case 16:
        case 64:
            addrbits = 6;
            break;
        case 128:
        case 256:
            addrbits = 8;
            break;
        default:
            assert(!"Unsupported EEPROM size, fallback to 64 words!");
            nwords = 64;
            addrbits = 6;
    }

    eeprom = (eeprom_t *)qemu_mallocz(sizeof(*eeprom) + nwords * 2);
    eeprom->size = nwords;
    eeprom->addrbits = addrbits;
    /* Output DO is tristate, read results in 1. */
    eeprom->eedo = 1;
    logout("eeprom = 0x%p, nwords = %u\n", eeprom, nwords);
    vmstate_register(dev, 0, &vmstate_eeprom, eeprom);
    return eeprom;
}

void eeprom93xx_free(DeviceState *dev, eeprom_t *eeprom)
{
    /* Destroy EEPROM. */
    logout("eeprom = 0x%p\n", eeprom);
    vmstate_unregister(dev, &vmstate_eeprom, eeprom);
    qemu_free(eeprom);
}

uint16_t *eeprom93xx_data(eeprom_t *eeprom)
{
    /* Get EEPROM data array. */
    return &eeprom->contents[0];
}

/* eof */
Commit	Line	Data
663e8e51 TS	1	/*
	2	* QEMU EEPROM 93xx emulation
	3	*
	4	* Copyright (c) 2006-2007 Stefan Weil
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
8167ee88	17	* along with this program; if not, see <http://www.gnu.org/licenses/>.
663e8e51 TS	18	*/
	19
	20	/* Emulation for serial EEPROMs:
	21	* NMC93C06 256-Bit (16 x 16)
	22	* NMC93C46 1024-Bit (64 x 16)
	23	* NMC93C56 2028 Bit (128 x 16)
	24	* NMC93C66 4096 Bit (256 x 16)
	25	* Compatible devices include FM93C46 and others.
	26	*
	27	* Other drivers use these interface functions:
	28	* eeprom93xx_new - add a new EEPROM (with 16, 64 or 256 words)
	29	* eeprom93xx_free - destroy EEPROM
	30	* eeprom93xx_read - read data from the EEPROM
	31	* eeprom93xx_write - write data to the EEPROM
	32	* eeprom93xx_data - get EEPROM data array for external manipulation
	33	*
	34	* Todo list:
	35	* - No emulation of EEPROM timings.
	36	*/
	37
87ecb68b	38	#include "hw.h"
663e8e51 TS	39	#include "eeprom93xx.h"
	40
	41	/* Debug EEPROM emulation. */
	42	//~ #define DEBUG_EEPROM
	43
	44	#ifdef DEBUG_EEPROM
001faf32	45	#define logout(fmt, ...) fprintf(stderr, "EEPROM\t%-24s" fmt, __func__, ## __VA_ARGS__)
663e8e51	46	#else
001faf32	47	#define logout(fmt, ...) ((void)0)
663e8e51 TS	48	#endif
663e8e51 TS	49
7ab2589c AJ	50	#define EEPROM_INSTANCE 0
	51	#define OLD_EEPROM_VERSION 20061112
	52	#define EEPROM_VERSION (OLD_EEPROM_VERSION + 1)
663e8e51 TS	53
	54	#if 0
	55	typedef enum {
	56	eeprom_read = 0x80, /* read register xx */
	57	eeprom_write = 0x40, /* write register xx */
	58	eeprom_erase = 0xc0, /* erase register xx */
	59	eeprom_ewen = 0x30, /* erase / write enable */
	60	eeprom_ewds = 0x00, /* erase / write disable */
	61	eeprom_eral = 0x20, /* erase all registers */
	62	eeprom_wral = 0x10, /* write all registers */
	63	eeprom_amask = 0x0f,
	64	eeprom_imask = 0xf0
	65	} eeprom_instruction_t;
	66	#endif
	67
	68	#ifdef DEBUG_EEPROM
	69	static const char *opstring[] = {
	70	"extended", "write", "read", "erase"
	71	};
	72	#endif
	73
c227f099	74	struct _eeprom_t {
663e8e51 TS	75	uint8_t tick;
	76	uint8_t address;
	77	uint8_t command;
	78	uint8_t writeable;
	79
	80	uint8_t eecs;
	81	uint8_t eesk;
	82	uint8_t eedo;
	83
	84	uint8_t addrbits;
7ab2589c	85	uint16_t size;
663e8e51 TS	86	uint16_t data;
	87	uint16_t contents[0];
	88	};
	89
	90	/* Code for saving and restoring of EEPROM state. */
	91
c4a0f2d3 JQ	92	/* Restore an uint16_t from an uint8_t
	93	This is a Big hack, but it is how the old state did it.
	94	*/
	95
	96	static int get_uint16_from_uint8(QEMUFile f, void pv, size_t size)
663e8e51	97	{
c4a0f2d3 JQ	98	uint16_t *v = pv;
	99	*v = qemu_get_ubyte(f);
	100	return 0;
	101	}
d4ae799c	102
c4a0f2d3 JQ	103	static void put_unused(QEMUFile f, void pv, size_t size)
	104	{
	105	fprintf(stderr, "uint16_from_uint8 is used only for backwards compatibility.\n");
	106	fprintf(stderr, "Never should be used to write a new state.\n");
	107	exit(0);
	108	}
d4ae799c	109
d05ac8fa	110	static const VMStateInfo vmstate_hack_uint16_from_uint8 = {
c4a0f2d3 JQ	111	.name = "uint16_from_uint8",
	112	.get = get_uint16_from_uint8,
	113	.put = put_unused,
	114	};
d4ae799c	115
c4a0f2d3 JQ	116	#define VMSTATE_UINT16_HACK_TEST(_f, _s, _t) \
c4a0f2d3 JQ	117	VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint16_from_uint8, uint16_t)
663e8e51	118
c4a0f2d3	119	static bool is_old_eeprom_version(void *opaque, int version_id)
663e8e51	120	{
c4a0f2d3 JQ	121	return version_id == OLD_EEPROM_VERSION;
c4a0f2d3 JQ	122	}
d4ae799c	123
c4a0f2d3 JQ	124	static const VMStateDescription vmstate_eeprom = {
	125	.name = "eeprom",
	126	.version_id = EEPROM_VERSION,
	127	.minimum_version_id = OLD_EEPROM_VERSION,
	128	.minimum_version_id_old = OLD_EEPROM_VERSION,
	129	.fields = (VMStateField []) {
	130	VMSTATE_UINT8(tick, eeprom_t),
	131	VMSTATE_UINT8(address, eeprom_t),
	132	VMSTATE_UINT8(command, eeprom_t),
	133	VMSTATE_UINT8(writeable, eeprom_t),
d4ae799c	134
c4a0f2d3 JQ	135	VMSTATE_UINT8(eecs, eeprom_t),
	136	VMSTATE_UINT8(eesk, eeprom_t),
	137	VMSTATE_UINT8(eedo, eeprom_t),
d4ae799c	138
c4a0f2d3 JQ	139	VMSTATE_UINT8(addrbits, eeprom_t),
	140	VMSTATE_UINT16_HACK_TEST(size, eeprom_t, is_old_eeprom_version),
	141	VMSTATE_UNUSED_TEST(is_old_eeprom_version, 1),
	142	VMSTATE_UINT16_EQUAL_V(size, eeprom_t, EEPROM_VERSION),
	143	VMSTATE_UINT16(data, eeprom_t),
	144	VMSTATE_VARRAY_UINT16_UNSAFE(contents, eeprom_t, size, 0,
	145	vmstate_info_uint16, uint16_t),
	146	VMSTATE_END_OF_LIST()
663e8e51	147	}
c4a0f2d3	148	};
663e8e51	149
c227f099	150	void eeprom93xx_write(eeprom_t *eeprom, int eecs, int eesk, int eedi)
663e8e51 TS	151	{
	152	uint8_t tick = eeprom->tick;
	153	uint8_t eedo = eeprom->eedo;
	154	uint16_t address = eeprom->address;
	155	uint8_t command = eeprom->command;
	156
	157	logout("CS=%u SK=%u DI=%u DO=%u, tick = %u\n",
	158	eecs, eesk, eedi, eedo, tick);
	159
	160	if (! eeprom->eecs && eecs) {
	161	/* Start chip select cycle. */
	162	logout("Cycle start, waiting for 1st start bit (0)\n");
	163	tick = 0;
	164	command = 0x0;
	165	address = 0x0;
	166	} else if (eeprom->eecs && ! eecs) {
	167	/* End chip select cycle. This triggers write / erase. */
	168	if (eeprom->writeable) {
	169	uint8_t subcommand = address >> (eeprom->addrbits - 2);
	170	if (command == 0 && subcommand == 2) {
	171	/* Erase all. */
	172	for (address = 0; address < eeprom->size; address++) {
	173	eeprom->contents[address] = 0xffff;
	174	}
	175	} else if (command == 3) {
	176	/* Erase word. */
	177	eeprom->contents[address] = 0xffff;
	178	} else if (tick >= 2 + 2 + eeprom->addrbits + 16) {
	179	if (command == 1) {
	180	/* Write word. */
	181	eeprom->contents[address] &= eeprom->data;
	182	} else if (command == 0 && subcommand == 1) {
	183	/* Write all. */
	184	for (address = 0; address < eeprom->size; address++) {
	185	eeprom->contents[address] &= eeprom->data;
	186	}
	187	}
	188	}
	189	}
	190	/* Output DO is tristate, read results in 1. */
	191	eedo = 1;
	192	} else if (eecs && ! eeprom->eesk && eesk) {
	193	/* Raising edge of clock shifts data in. */
	194	if (tick == 0) {
	195	/* Wait for 1st start bit. */
	196	if (eedi == 0) {
	197	logout("Got correct 1st start bit, waiting for 2nd start bit (1)\n");
	198	tick++;
	199	} else {
	200	logout("wrong 1st start bit (is 1, should be 0)\n");
	201	tick = 2;
	202	//~ assert(!"wrong start bit");
	203	}
	204	} else if (tick == 1) {
	205	/* Wait for 2nd start bit. */
	206	if (eedi != 0) {
	207	logout("Got correct 2nd start bit, getting command + address\n");
	208	tick++;
	209	} else {
	210	logout("1st start bit is longer than needed\n");
	211	}
	212	} else if (tick < 2 + 2) {
	213	/* Got 2 start bits, transfer 2 opcode bits. */
	214	tick++;
215	command <<= 1;
216	if (eedi) {
217	command += 1;
218	}
219	} else if (tick < 2 + 2 + eeprom->addrbits) {
220	/* Got 2 start bits and 2 opcode bits, transfer all address bits. */
221	tick++;
222	address = ((address << 1) \| eedi);
223	if (tick == 2 + 2 + eeprom->addrbits) {
224	logout("%s command, address = 0x%02x (value 0x%04x)\n",
225	opstring[command], address, eeprom->contents[address]);
226	if (command == 2) {
227	eedo = 0;
228	}
229	address = address % eeprom->size;
230	if (command == 0) {
231	/* Command code in upper 2 bits of address. */
232	switch (address >> (eeprom->addrbits - 2)) {
233	case 0:
234	logout("write disable command\n");
235	eeprom->writeable = 0;
236	break;
237	case 1:
238	logout("write all command\n");
239	break;
240	case 2:
241	logout("erase all command\n");
242	break;
243	case 3:
244	logout("write enable command\n");
245	eeprom->writeable = 1;
246	break;
247	}
248	} else {
249	/* Read, write or erase word. */
250	eeprom->data = eeprom->contents[address];
251	}
252	}
253	} else if (tick < 2 + 2 + eeprom->addrbits + 16) {
254	/* Transfer 16 data bits. */
255	tick++;
256	if (command == 2) {
257	/* Read word. */
258	eedo = ((eeprom->data & 0x8000) != 0);
259	}
260	eeprom->data <<= 1;
261	eeprom->data += eedi;
262	} else {
263	logout("additional unneeded tick, not processed\n");
264	}
265	}
266	/* Save status of EEPROM. */
267	eeprom->tick = tick;
268	eeprom->eecs = eecs;
269	eeprom->eesk = eesk;
270	eeprom->eedo = eedo;
271	eeprom->address = address;
272	eeprom->command = command;
273	}
274
c227f099	275	uint16_t eeprom93xx_read(eeprom_t *eeprom)
663e8e51 TS	276	{
	277	/* Return status of pin DO (0 or 1). */
	278	logout("CS=%u DO=%u\n", eeprom->eecs, eeprom->eedo);
	279	return (eeprom->eedo);
	280	}
	281
	282	#if 0
	283	void eeprom93xx_reset(eeprom_t *eeprom)
	284	{
	285	/* prepare eeprom */
	286	logout("eeprom = 0x%p\n", eeprom);
	287	eeprom->tick = 0;
	288	eeprom->command = 0;
	289	}
	290	#endif
	291
5fce2b3e	292	eeprom_t eeprom93xx_new(DeviceState dev, uint16_t nwords)
663e8e51 TS	293	{
663e8e51 TS	294	/* Add a new EEPROM (with 16, 64 or 256 words). */
c227f099	295	eeprom_t *eeprom;
663e8e51 TS	296	uint8_t addrbits;
	297
	298	switch (nwords) {
	299	case 16:
	300	case 64:
	301	addrbits = 6;
	302	break;
	303	case 128:
	304	case 256:
	305	addrbits = 8;
	306	break;
	307	default:
	308	assert(!"Unsupported EEPROM size, fallback to 64 words!");
	309	nwords = 64;
	310	addrbits = 6;
	311	}
	312
c227f099	313	eeprom = (eeprom_t )qemu_mallocz(sizeof(eeprom) + nwords * 2);
663e8e51 TS	314	eeprom->size = nwords;
	315	eeprom->addrbits = addrbits;
	316	/* Output DO is tristate, read results in 1. */
	317	eeprom->eedo = 1;
	318	logout("eeprom = 0x%p, nwords = %u\n", eeprom, nwords);
5fce2b3e	319	vmstate_register(dev, 0, &vmstate_eeprom, eeprom);
663e8e51 TS	320	return eeprom;
	321	}
	322
5fce2b3e	323	void eeprom93xx_free(DeviceState dev, eeprom_t eeprom)
663e8e51 TS	324	{
	325	/* Destroy EEPROM. */
	326	logout("eeprom = 0x%p\n", eeprom);
5fce2b3e	327	vmstate_unregister(dev, &vmstate_eeprom, eeprom);
663e8e51 TS	328	qemu_free(eeprom);
	329	}
	330
c227f099	331	uint16_t eeprom93xx_data(eeprom_t eeprom)
663e8e51 TS	332	{
	333	/* Get EEPROM data array. */
	334	return &eeprom->contents[0];
	335	}
	336
	337	/* eof */