[people/ms/u-boot.git] / cpu / mpc512x / i2c.c

/*
 * (C) Copyright 2003 - 2007
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 * Based on the MPC5xxx code.
 */

#include <common.h>

DECLARE_GLOBAL_DATA_PTR;

#ifdef CONFIG_HARD_I2C

#include <mpc512x.h>
#include <i2c.h>

#define immr ((immap_t *)CONFIG_SYS_IMMR)

/* by default set I2C bus 0 active */
static unsigned int bus_num = 0;

#define I2C_TIMEOUT	100
#define I2C_RETRIES	3

struct mpc512x_i2c_tap {
	int scl2tap;
	int tap2tap;
};

static int  mpc_reg_in(volatile u32 *reg);
static void mpc_reg_out(volatile u32 *reg, int val, int mask);
static int  wait_for_bb(void);
static int  wait_for_pin(int *status);
static int  do_address(uchar chip, char rdwr_flag);
static int  send_bytes(uchar chip, char *buf, int len);
static int  receive_bytes(uchar chip, char *buf, int len);
static int  mpc_get_fdr(int);

static int mpc_reg_in (volatile u32 *reg)
{
	int ret = *reg >> 24;
	__asm__ __volatile__ ("eieio");
	return ret;
}

static void mpc_reg_out (volatile u32 *reg, int val, int mask)
{
	int tmp;

	if (!mask) {
		*reg = val << 24;
	} else {
		tmp = mpc_reg_in (reg);
		*reg = ((tmp & ~mask) | (val & mask)) << 24;
	}
	__asm__ __volatile__ ("eieio");

	return;
}

static int wait_for_bb (void)
{
	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	int timeout = I2C_TIMEOUT;
	int status;

	status = mpc_reg_in (&regs->msr);

	while (timeout-- && (status & I2C_BB)) {
		volatile int temp;
		mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
		temp = mpc_reg_in (&regs->mdr);
		mpc_reg_out (&regs->mcr, 0, I2C_STA);
		mpc_reg_out (&regs->mcr, 0, 0);
		mpc_reg_out (&regs->mcr, I2C_EN, 0);

		udelay (1000);
		status = mpc_reg_in (&regs->msr);
	}

	return (status & I2C_BB);
}

static int wait_for_pin (int *status)
{
	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	int timeout = I2C_TIMEOUT;

	*status = mpc_reg_in (&regs->msr);

	while (timeout-- && !(*status & I2C_IF)) {
		udelay (1000);
		*status = mpc_reg_in (&regs->msr);
	}

	if (!(*status & I2C_IF)) {
		return -1;
	}

	mpc_reg_out (&regs->msr, 0, I2C_IF);

	return 0;
}

static int do_address (uchar chip, char rdwr_flag)
{
	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	int status;

	chip <<= 1;

	if (rdwr_flag) {
		chip |= 1;
	}

	mpc_reg_out (&regs->mcr, I2C_TX, I2C_TX);
	mpc_reg_out (&regs->mdr, chip, 0);

	if (wait_for_pin (&status)) {
		return -2;
	}

	if (status & I2C_RXAK) {
		return -3;
	}

	return 0;
}

static int send_bytes (uchar chip, char *buf, int len)
{
	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	int wrcount;
	int status;

	for (wrcount = 0; wrcount < len; ++wrcount) {

		mpc_reg_out (&regs->mdr, buf[wrcount], 0);

		if (wait_for_pin (&status)) {
			break;
		}

		if (status & I2C_RXAK) {
			break;
		}

	}

	return !(wrcount == len);
}

static int receive_bytes (uchar chip, char *buf, int len)
{
	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	int dummy   = 1;
	int rdcount = 0;
	int status;
	int i;

	mpc_reg_out (&regs->mcr, 0, I2C_TX);

	for (i = 0; i < len; ++i) {
		buf[rdcount] = mpc_reg_in (&regs->mdr);

		if (dummy) {
			dummy = 0;
		} else {
			rdcount++;
		}

		if (wait_for_pin (&status)) {
			return -4;
		}
	}

	mpc_reg_out (&regs->mcr, I2C_TXAK, I2C_TXAK);
	buf[rdcount++] = mpc_reg_in (&regs->mdr);

	if (wait_for_pin (&status)) {
		return -5;
	}

	mpc_reg_out (&regs->mcr, 0, I2C_TXAK);

	return 0;
}

/**************** I2C API ****************/

void i2c_init (int speed, int saddr)
{
	int i;
	for(i = 0; i < I2C_BUS_CNT; i++){
		i2c512x_dev_t *regs = &immr->i2c.dev[i];
		mpc_reg_out (&regs->mcr, 0, 0);

		/* Set clock */
		mpc_reg_out (&regs->mfdr, mpc_get_fdr (speed), 0);
		mpc_reg_out (&regs->madr, saddr << 1, 0);

		/* Enable module */
		mpc_reg_out (&regs->mcr, I2C_EN, I2C_INIT_MASK);
		mpc_reg_out (&regs->msr, 0, I2C_IF);
	}

	/* Disable interrupts */
	immr->i2c.icr = 0;
	/* Turn off filters */
	immr->i2c.mifr = 0;
	return;
}

static int mpc_get_fdr (int speed)
{
	static int fdr = -1;

	if (fdr == -1) {
		ulong best_speed = 0;
		ulong divider;
		ulong ips, scl;
		ulong bestmatch = 0xffffffffUL;
		int best_i = 0, best_j = 0, i, j;
		int SCL_Tap[] = { 9, 10, 12, 15, 5, 6, 7, 8};
		struct mpc512x_i2c_tap scltap[] = {
			{4, 1},
			{4, 2},
			{6, 4},
			{6, 8},
			{14, 16},
			{30, 32},
			{62, 64},
			{126, 128}
		};

		ips = gd->ips_clk;
		for (i = 7; i >= 0; i--) {
			for (j = 7; j >= 0; j--) {
				scl = 2 * (scltap[j].scl2tap +
					   (SCL_Tap[i] - 1) * scltap[j].tap2tap
					   + 2);
				if (ips <= speed*scl) {
					if ((speed*scl - ips) < bestmatch) {
						bestmatch = speed*scl - ips;
						best_i = i;
						best_j = j;
						best_speed = ips/scl;
					}
				}
			}
		}
		divider = (best_i & 3) | ((best_i & 4) << 3) | (best_j << 2);
		if (gd->flags & GD_FLG_RELOC) {
			fdr = divider;
		} else {
			debug("%ld kHz, \n", best_speed / 1000);
			return divider;
		}
	}

	return fdr;
}

int i2c_probe (uchar chip)
{
	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	int i;

	for (i = 0; i < I2C_RETRIES; i++) {
		mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);

		if (! do_address (chip, 0)) {
			mpc_reg_out (&regs->mcr, 0, I2C_STA);
			udelay (500);
			break;
		}

		mpc_reg_out (&regs->mcr, 0, I2C_STA);
		udelay (500);
	}

	return (i == I2C_RETRIES);
}

int i2c_read (uchar chip, uint addr, int alen, uchar *buf, int len)
{
	char xaddr[4];
	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	int ret = -1;

	xaddr[0] = (addr >> 24) & 0xFF;
	xaddr[1] = (addr >> 16) & 0xFF;
	xaddr[2] = (addr >>  8) & 0xFF;
	xaddr[3] =  addr	& 0xFF;

	if (wait_for_bb ()) {
		printf ("i2c_read: bus is busy\n");
		goto Done;
	}

	mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
	if (do_address (chip, 0)) {
		printf ("i2c_read: failed to address chip\n");
		goto Done;
	}

	if (send_bytes (chip, &xaddr[4-alen], alen)) {
		printf ("i2c_read: send_bytes failed\n");
		goto Done;
	}

	mpc_reg_out (&regs->mcr, I2C_RSTA, I2C_RSTA);
	if (do_address (chip, 1)) {
		printf ("i2c_read: failed to address chip\n");
		goto Done;
	}

	if (receive_bytes (chip, (char *)buf, len)) {
		printf ("i2c_read: receive_bytes failed\n");
		goto Done;
	}

	ret = 0;
Done:
	mpc_reg_out (&regs->mcr, 0, I2C_STA);
	return ret;
}

int i2c_write (uchar chip, uint addr, int alen, uchar *buf, int len)
{
	char xaddr[4];
	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	int ret = -1;

	xaddr[0] = (addr >> 24) & 0xFF;
	xaddr[1] = (addr >> 16) & 0xFF;
	xaddr[2] = (addr >>  8) & 0xFF;
	xaddr[3] =  addr	& 0xFF;

	if (wait_for_bb ()) {
		printf ("i2c_write: bus is busy\n");
		goto Done;
	}

	mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
	if (do_address (chip, 0)) {
		printf ("i2c_write: failed to address chip\n");
		goto Done;
	}

	if (send_bytes (chip, &xaddr[4-alen], alen)) {
		printf ("i2c_write: send_bytes failed\n");
		goto Done;
	}

	if (send_bytes (chip, (char *)buf, len)) {
		printf ("i2c_write: send_bytes failed\n");
		goto Done;
	}

	ret = 0;
Done:
	mpc_reg_out (&regs->mcr, 0, I2C_STA);
	return ret;
}

uchar i2c_reg_read (uchar chip, uchar reg)
{
	uchar buf;

	i2c_read (chip, reg, 1, &buf, 1);

	return buf;
}

void i2c_reg_write (uchar chip, uchar reg, uchar val)
{
	i2c_write (chip, reg, 1, &val, 1);

	return;
}


int i2c_set_bus_num (unsigned int bus)
{
	if (bus >= I2C_BUS_CNT) {
		return -1;
	}
	bus_num = bus;

	return 0;
}

unsigned int i2c_get_bus_num (void)
{
	return bus_num;
}

/* TODO */
unsigned int i2c_get_bus_speed (void)
{
	return -1;
}

int i2c_set_bus_speed (unsigned int speed)
{
	if (speed != CONFIG_SYS_I2C_SPEED)
		return -1;

	return 0;
}

#endif	/* CONFIG_HARD_I2C */
Commit	Line	Data
8993e54b RJ	1	/*
	2	* (C) Copyright 2003 - 2007
	3	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*
	23	* Based on the MPC5xxx code.
	24	*/
	25
	26	#include <common.h>
	27
	28	DECLARE_GLOBAL_DATA_PTR;
	29
	30	#ifdef CONFIG_HARD_I2C
	31
	32	#include <mpc512x.h>
	33	#include <i2c.h>
	34
6d0f6bcf	35	#define immr ((immap_t *)CONFIG_SYS_IMMR)
8993e54b RJ	36
	37	/* by default set I2C bus 0 active */
	38	static unsigned int bus_num = 0;
	39
	40	#define I2C_TIMEOUT 100
	41	#define I2C_RETRIES 3
	42
	43	struct mpc512x_i2c_tap {
	44	int scl2tap;
	45	int tap2tap;
	46	};
	47
	48	static int mpc_reg_in(volatile u32 *reg);
	49	static void mpc_reg_out(volatile u32 *reg, int val, int mask);
	50	static int wait_for_bb(void);
	51	static int wait_for_pin(int *status);
	52	static int do_address(uchar chip, char rdwr_flag);
	53	static int send_bytes(uchar chip, char *buf, int len);
	54	static int receive_bytes(uchar chip, char *buf, int len);
	55	static int mpc_get_fdr(int);
	56
	57	static int mpc_reg_in (volatile u32 *reg)
	58	{
	59	int ret = *reg >> 24;
	60	__asm__ __volatile__ ("eieio");
	61	return ret;
	62	}
	63
	64	static void mpc_reg_out (volatile u32 *reg, int val, int mask)
	65	{
	66	int tmp;
	67
	68	if (!mask) {
	69	*reg = val << 24;
	70	} else {
	71	tmp = mpc_reg_in (reg);
	72	*reg = ((tmp & ~mask) \| (val & mask)) << 24;
	73	}
	74	__asm__ __volatile__ ("eieio");
	75
	76	return;
	77	}
	78
	79	static int wait_for_bb (void)
	80	{
	81	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	82	int timeout = I2C_TIMEOUT;
	83	int status;
	84
	85	status = mpc_reg_in (&regs->msr);
	86
	87	while (timeout-- && (status & I2C_BB)) {
	88	volatile int temp;
	89	mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
	90	temp = mpc_reg_in (&regs->mdr);
	91	mpc_reg_out (&regs->mcr, 0, I2C_STA);
	92	mpc_reg_out (&regs->mcr, 0, 0);
	93	mpc_reg_out (&regs->mcr, I2C_EN, 0);
	94
	95	udelay (1000);
	96	status = mpc_reg_in (&regs->msr);
	97	}
	98
	99	return (status & I2C_BB);
100	}
101
102	static int wait_for_pin (int *status)
103	{
104	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
105	int timeout = I2C_TIMEOUT;
106
107	*status = mpc_reg_in (&regs->msr);
108
109	while (timeout-- && !(*status & I2C_IF)) {
110	udelay (1000);
111	*status = mpc_reg_in (&regs->msr);
112	}
113
114	if (!(*status & I2C_IF)) {
115	return -1;
116	}
117
118	mpc_reg_out (&regs->msr, 0, I2C_IF);
119
120	return 0;
121	}
122
123	static int do_address (uchar chip, char rdwr_flag)
124	{
125	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
126	int status;
127
128	chip <<= 1;
129
130	if (rdwr_flag) {
131	chip \|= 1;
132	}
133
134	mpc_reg_out (&regs->mcr, I2C_TX, I2C_TX);
135	mpc_reg_out (&regs->mdr, chip, 0);
136
137	if (wait_for_pin (&status)) {
138	return -2;
139	}
140
141	if (status & I2C_RXAK) {
142	return -3;
143	}
144
145	return 0;
146	}
147
148	static int send_bytes (uchar chip, char *buf, int len)
149	{
150	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
151	int wrcount;
152	int status;
153
154	for (wrcount = 0; wrcount < len; ++wrcount) {
155
156	mpc_reg_out (&regs->mdr, buf[wrcount], 0);
157
158	if (wait_for_pin (&status)) {
159	break;
160	}
161
162	if (status & I2C_RXAK) {
163	break;
164	}
165
166	}
167
168	return !(wrcount == len);
169	}
170
171	static int receive_bytes (uchar chip, char *buf, int len)
172	{
173	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
174	int dummy = 1;
175	int rdcount = 0;
176	int status;
177	int i;
178
179	mpc_reg_out (&regs->mcr, 0, I2C_TX);
180
181	for (i = 0; i < len; ++i) {
182	buf[rdcount] = mpc_reg_in (&regs->mdr);
183
184	if (dummy) {
185	dummy = 0;
186	} else {
187	rdcount++;
188	}
189
190	if (wait_for_pin (&status)) {
191	return -4;
192	}
193	}
194
195	mpc_reg_out (&regs->mcr, I2C_TXAK, I2C_TXAK);
196	buf[rdcount++] = mpc_reg_in (&regs->mdr);
197
198	if (wait_for_pin (&status)) {
199	return -5;
200	}
201
202	mpc_reg_out (&regs->mcr, 0, I2C_TXAK);
203
204	return 0;
205	}
206
207	/************** I2C API **************/
208
209	void i2c_init (int speed, int saddr)
210	{
211	int i;
212	for(i = 0; i < I2C_BUS_CNT; i++){
213	i2c512x_dev_t *regs = &immr->i2c.dev[i];
214	mpc_reg_out (&regs->mcr, 0, 0);
215
216	/* Set clock */
217	mpc_reg_out (&regs->mfdr, mpc_get_fdr (speed), 0);
218	mpc_reg_out (&regs->madr, saddr << 1, 0);
219
220	/* Enable module */
221	mpc_reg_out (&regs->mcr, I2C_EN, I2C_INIT_MASK);
222	mpc_reg_out (&regs->msr, 0, I2C_IF);
223	}
224
225	/* Disable interrupts */
226	immr->i2c.icr = 0;
227	/* Turn off filters */
228	immr->i2c.mifr = 0;
229	return;
230	}
231
232	static int mpc_get_fdr (int speed)
233	{
234	static int fdr = -1;
235
236	if (fdr == -1) {
237	ulong best_speed = 0;
238	ulong divider;
5d49e0e1	239	ulong ips, scl;
8993e54b RJ	240	ulong bestmatch = 0xffffffffUL;
	241	int best_i = 0, best_j = 0, i, j;
	242	int SCL_Tap[] = { 9, 10, 12, 15, 5, 6, 7, 8};
	243	struct mpc512x_i2c_tap scltap[] = {
	244	{4, 1},
	245	{4, 2},
	246	{6, 4},
	247	{6, 8},
	248	{14, 16},
	249	{30, 32},
	250	{62, 64},
	251	{126, 128}
	252	};
	253
5d49e0e1	254	ips = gd->ips_clk;
8993e54b RJ	255	for (i = 7; i >= 0; i--) {
	256	for (j = 7; j >= 0; j--) {
	257	scl = 2 * (scltap[j].scl2tap +
	258	(SCL_Tap[i] - 1) * scltap[j].tap2tap
	259	+ 2);
5d49e0e1 GB	260	if (ips <= speed*scl) {
	261	if ((speed*scl - ips) < bestmatch) {
	262	bestmatch = speed*scl - ips;
8993e54b RJ	263	best_i = i;
8993e54b RJ	264	best_j = j;
5d49e0e1	265	best_speed = ips/scl;
8993e54b RJ	266	}
	267	}
	268	}
	269	}
	270	divider = (best_i & 3) \| ((best_i & 4) << 3) \| (best_j << 2);
	271	if (gd->flags & GD_FLG_RELOC) {
	272	fdr = divider;
	273	} else {
	274	debug("%ld kHz, \n", best_speed / 1000);
	275	return divider;
	276	}
	277	}
	278
	279	return fdr;
	280	}
	281
	282	int i2c_probe (uchar chip)
	283	{
	284	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	285	int i;
	286
	287	for (i = 0; i < I2C_RETRIES; i++) {
	288	mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
	289
	290	if (! do_address (chip, 0)) {
	291	mpc_reg_out (&regs->mcr, 0, I2C_STA);
	292	udelay (500);
	293	break;
	294	}
	295
	296	mpc_reg_out (&regs->mcr, 0, I2C_STA);
	297	udelay (500);
	298	}
	299
	300	return (i == I2C_RETRIES);
	301	}
	302
	303	int i2c_read (uchar chip, uint addr, int alen, uchar *buf, int len)
	304	{
	305	char xaddr[4];
	306	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
	307	int ret = -1;
	308
	309	xaddr[0] = (addr >> 24) & 0xFF;
	310	xaddr[1] = (addr >> 16) & 0xFF;
	311	xaddr[2] = (addr >> 8) & 0xFF;
	312	xaddr[3] = addr & 0xFF;
	313
	314	if (wait_for_bb ()) {
	315	printf ("i2c_read: bus is busy\n");
	316	goto Done;
	317	}
	318
	319	mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
	320	if (do_address (chip, 0)) {
	321	printf ("i2c_read: failed to address chip\n");
	322	goto Done;
	323	}
	324
	325	if (send_bytes (chip, &xaddr[4-alen], alen)) {
	326	printf ("i2c_read: send_bytes failed\n");
	327	goto Done;
	328	}
	329
330	mpc_reg_out (&regs->mcr, I2C_RSTA, I2C_RSTA);
331	if (do_address (chip, 1)) {
332	printf ("i2c_read: failed to address chip\n");
333	goto Done;
334	}
335
336	if (receive_bytes (chip, (char *)buf, len)) {
337	printf ("i2c_read: receive_bytes failed\n");
338	goto Done;
339	}
340
341	ret = 0;
342	Done:
343	mpc_reg_out (&regs->mcr, 0, I2C_STA);
344	return ret;
345	}
346
347	int i2c_write (uchar chip, uint addr, int alen, uchar *buf, int len)
348	{
349	char xaddr[4];
350	i2c512x_dev_t *regs = &immr->i2c.dev[bus_num];
351	int ret = -1;
352
353	xaddr[0] = (addr >> 24) & 0xFF;
354	xaddr[1] = (addr >> 16) & 0xFF;
355	xaddr[2] = (addr >> 8) & 0xFF;
356	xaddr[3] = addr & 0xFF;
357
358	if (wait_for_bb ()) {
359	printf ("i2c_write: bus is busy\n");
360	goto Done;
361	}
362
363	mpc_reg_out (&regs->mcr, I2C_STA, I2C_STA);
364	if (do_address (chip, 0)) {
365	printf ("i2c_write: failed to address chip\n");
366	goto Done;
367	}
368
369	if (send_bytes (chip, &xaddr[4-alen], alen)) {
370	printf ("i2c_write: send_bytes failed\n");
371	goto Done;
372	}
373
374	if (send_bytes (chip, (char *)buf, len)) {
375	printf ("i2c_write: send_bytes failed\n");
376	goto Done;
377	}
378
379	ret = 0;
380	Done:
381	mpc_reg_out (&regs->mcr, 0, I2C_STA);
382	return ret;
383	}
384
385	uchar i2c_reg_read (uchar chip, uchar reg)
386	{
387	uchar buf;
388
389	i2c_read (chip, reg, 1, &buf, 1);
390
391	return buf;
392	}
393
394	void i2c_reg_write (uchar chip, uchar reg, uchar val)
395	{
396	i2c_write (chip, reg, 1, &val, 1);
397
398	return;
399	}
400
401
402	int i2c_set_bus_num (unsigned int bus)
403	{
404	if (bus >= I2C_BUS_CNT) {
405	return -1;
406	}
407	bus_num = bus;
408
409	return 0;
410	}
411
412	unsigned int i2c_get_bus_num (void)
413	{
414	return bus_num;
415	}
416
417	/* TODO */
418	unsigned int i2c_get_bus_speed (void)
419	{
420	return -1;
421	}
422
423	int i2c_set_bus_speed (unsigned int speed)
424	{
6d0f6bcf	425	if (speed != CONFIG_SYS_I2C_SPEED)
8993e54b RJ	426	return -1;
	427
	428	return 0;
	429	}
	430
	431	#endif /* CONFIG_HARD_I2C */