[people/ms/u-boot.git] / drivers / tsi108_i2c.c

/*
 * (C) Copyright 2004 Tundra Semiconductor Corp.
 * Author: Alex Bounine
 *
 * 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
 *
 */

#include <config.h>

#ifdef CONFIG_TSI108_I2C

#include <common.h>
#include <tsi108.h>

#if (CONFIG_COMMANDS & CFG_CMD_I2C)

#define I2C_DELAY           100000
#undef  DEBUG_I2C

#ifdef DEBUG_I2C
#define DPRINT(x) printf(x)
#else
#define DPRINT(x)
#endif

/* All functions assume that Tsi108 I2C block is the only master on the bus */
/* I2C read helper function */

static int i2c_read_byte(
		uint i2c_chan,	/* I2C channel number: 0 - main, 1 - SDC SPD */
		uchar chip_addr,/* I2C device address on the bus */
		uint byte_addr,	/* Byte address within I2C device */
		uchar * buffer	/* pointer to data buffer */
		)
{
	u32 temp;
	u32 to_count = I2C_DELAY;
	u32 op_status = TSI108_I2C_TIMEOUT_ERR;
	u32 chan_offset = TSI108_I2C_OFFSET;

	DPRINT(("I2C read_byte() %d 0x%02x 0x%02x\n",
		i2c_chan, chip_addr, byte_addr));

	if (0 != i2c_chan) {
		chan_offset = TSI108_I2C_SDRAM_OFFSET;
	}

	/* Check if I2C operation is in progress */
	temp = *(u32 *) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);

	if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS |
			  I2C_CNTRL2_START))
	    ) {
		/* Set device address and operation (read = 0) */
		temp = (byte_addr << 16) | ((chip_addr & 0x07) << 8) |
		    ((chip_addr >> 3) & 0x0F);
		*(u32 *) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL1) =
		    temp;

		/* Issue the read command
		 * (at this moment all other parameters are 0 
		 * (size = 1 byte, lane = 0)
		 */

		*(u32 *) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2) =
		    (I2C_CNTRL2_START);

		/* Wait until operation completed */
		do {
			/* Read I2C operation status */
			temp =
			    *(u32 *) (CFG_TSI108_CSR_BASE + chan_offset +
				      I2C_CNTRL2);

			if (0 ==
			    (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_START)))
			{
				if (0 ==
				    (temp &
				     (I2C_CNTRL2_I2C_CFGERR |
				      I2C_CNTRL2_I2C_TO_ERR))
				    ) {
					op_status = TSI108_I2C_SUCCESS;

					temp = *(u32 *) (CFG_TSI108_CSR_BASE +
							 chan_offset +
							 I2C_RD_DATA);

					*buffer = (u8) (temp & 0xFF);
				} else {
					/* report HW error */
					op_status = TSI108_I2C_IF_ERROR;

					DPRINT(("I2C HW error reported: 0x%02x\n", temp));
				}

				break;
			}
		} while (to_count--);
	} else {
		op_status = TSI108_I2C_IF_BUSY;

		DPRINT(("I2C Transaction start failed: 0x%02x\n", temp));
	}

	DPRINT(("I2C read_byte() status: 0x%02x\n", op_status));
	return op_status;
}

/* 
 * I2C Read interface as defined in "include/i2c.h" :
 *   chip_addr: I2C chip address, range 0..127
 *                  (to read from SPD channel EEPROM use (0xD0 ... 0xD7)
 *              NOTE: The bit 7 in the chip_addr serves as a channel select.
 *              This hack is for enabling "isdram" command on Tsi108 boards
 *              without changes to common code. Used for I2C reads only. 
 *   byte_addr: Memory or register address within the chip
 *   alen:      Number of bytes to use for addr (typically 1, 2 for larger
 *              memories, 0 for register type devices with only one
 *              register)
 *   buffer:    Pointer to destination buffer for data to be read
 *   len:       How many bytes to read
 *
 *   Returns: 0 on success, not 0 on failure
 */

int i2c_read(uchar chip_addr, uint byte_addr, int alen, uchar * buffer, int len)
{
	u32 op_status = TSI108_I2C_PARAM_ERR;
	u32 i2c_if = 0;

	/* Hack to support second (SPD) I2C controller (SPD EEPROM read only).*/
	if (0xD0 == (chip_addr & ~0x07)) {
		i2c_if = 1;
		chip_addr &= 0x7F;
	}
	/* Check for valid I2C address */
	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
		while (len--) {
			op_status =
			    i2c_read_byte(i2c_if, chip_addr, byte_addr++,
					  buffer++);

			if (TSI108_I2C_SUCCESS != op_status) {
				DPRINT(("I2C read_byte() failed: 0x%02x (%d left)\n", op_status, len));

				break;
			}
		}
	}

	DPRINT(("I2C read() status: 0x%02x\n", op_status));
	return op_status;
}

/* I2C write helper function */

static int i2c_write_byte(uchar chip_addr,/* I2C device address on the bus */
			  uint byte_addr, /* Byte address within I2C device */
			  uchar * buffer  /*  pointer to data buffer */
			  )
{
	u32 temp;
	u32 to_count = I2C_DELAY;
	u32 op_status = TSI108_I2C_TIMEOUT_ERR;

	/* Check if I2C operation is in progress */
	temp = *(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);

	if (0 ==
	    (temp &
	     (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START)))
	{
		/* Place data into the I2C Tx Register */
		*(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
			  I2C_TX_DATA) = (u32) * buffer;

		/* Set device address and operation  */
		temp =
		    I2C_CNTRL1_I2CWRITE | (byte_addr << 16) |
		    ((chip_addr & 0x07) << 8) | ((chip_addr >> 3) & 0x0F);
		*(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
			  I2C_CNTRL1) = temp;

		/* Issue the write command (at this moment all other parameters
		 * are 0 (size = 1 byte, lane = 0)
		 */
		
		*(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
			  I2C_CNTRL2) = (I2C_CNTRL2_START);

		op_status = TSI108_I2C_TIMEOUT_ERR;

		/* Wait until operation completed */
		do {
			// Read I2C operation status
			temp =
			    *(u32 *) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
				      I2C_CNTRL2);

			if (0 ==
			    (temp & (I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START)))
			{
				if (0 ==
				    (temp &
				     (I2C_CNTRL2_I2C_CFGERR |
				      I2C_CNTRL2_I2C_TO_ERR))) {
					op_status = TSI108_I2C_SUCCESS;
				} else {
					/* report detected HW error */
					op_status = TSI108_I2C_IF_ERROR;

					DPRINT(("I2C HW error reported: 0x%02x\n", temp));
				}

				break;
			}

		} while (to_count--);
	} else {
		op_status = TSI108_I2C_IF_BUSY;

		DPRINT(("I2C Transaction start failed: 0x%02x\n", temp));
	}

	return op_status;
}

/* 
 * I2C Write interface as defined in "include/i2c.h" :
 *   chip_addr: I2C chip address, range 0..127
 *   byte_addr: Memory or register address within the chip
 *   alen:      Number of bytes to use for addr (typically 1, 2 for larger
 *              memories, 0 for register type devices with only one
 *              register)
 *   buffer:    Pointer to data to be written
 *   len:       How many bytes to write
 *
 *   Returns: 0 on success, not 0 on failure
 */

int i2c_write(uchar chip_addr, uint byte_addr, int alen, uchar * buffer,
	      int len)
{
	u32 op_status = TSI108_I2C_PARAM_ERR;

	/* Check for valid I2C address */
	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
		while (len--) {
			op_status =
			    i2c_write_byte(chip_addr, byte_addr++, buffer++);

			if (TSI108_I2C_SUCCESS != op_status) {
				DPRINT(("I2C write_byte() failed: 0x%02x (%d left)\n", op_status, len));

				break;
			}
		}
	}

	return op_status;
}

/* 
 * I2C interface function as defined in "include/i2c.h".
 * Probe the given I2C chip address by reading single byte from offset 0.
 * Returns 0 if a chip responded, not 0 on failure.
 */

int i2c_probe(uchar chip)
{
	u32 tmp;

	/*
	 * Try to read the first location of the chip.
	 * The Tsi108 HW doesn't support sending just the chip address
	 * and checkong for an <ACK> back.
	 */
	return i2c_read(chip, 0, 1, (char *)&tmp, 1);
}

#endif				/* (CONFIG_COMMANDS & CFG_CMD_I2C) */
#endif /* CONFIG_TSI108_I2C */
Commit	Line	Data
b825f158	1	/*
	2	* (C) Copyright 2004 Tundra Semiconductor Corp.
	3	* Author: Alex Bounine
	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	*/
	24
	25	#include <config.h>
	26
	27	#ifdef CONFIG_TSI108_I2C
	28
	29	#include <common.h>
	30	#include <tsi108.h>
	31
	32	#if (CONFIG_COMMANDS & CFG_CMD_I2C)
	33
	34	#define I2C_DELAY 100000
	35	#undef DEBUG_I2C
	36
	37	#ifdef DEBUG_I2C
	38	#define DPRINT(x) printf(x)
	39	#else
	40	#define DPRINT(x)
	41	#endif
	42
	43	/* All functions assume that Tsi108 I2C block is the only master on the bus */
	44	/* I2C read helper function */
	45
	46	static int i2c_read_byte(
	47	uint i2c_chan, /* I2C channel number: 0 - main, 1 - SDC SPD */
	48	uchar chip_addr,/* I2C device address on the bus */
	49	uint byte_addr, /* Byte address within I2C device */
	50	uchar * buffer /* pointer to data buffer */
	51	)
	52	{
	53	u32 temp;
	54	u32 to_count = I2C_DELAY;
	55	u32 op_status = TSI108_I2C_TIMEOUT_ERR;
	56	u32 chan_offset = TSI108_I2C_OFFSET;
	57
	58	DPRINT(("I2C read_byte() %d 0x%02x 0x%02x\n",
	59	i2c_chan, chip_addr, byte_addr));
	60
	61	if (0 != i2c_chan) {
	62	chan_offset = TSI108_I2C_SDRAM_OFFSET;
	63	}
	64
65	/* Check if I2C operation is in progress */
66	temp = (u32 ) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2);
67
68	if (0 == (temp & (I2C_CNTRL2_RD_STATUS \| I2C_CNTRL2_WR_STATUS \|
69	I2C_CNTRL2_START))
70	) {
71	/* Set device address and operation (read = 0) */
72	temp = (byte_addr << 16) \| ((chip_addr & 0x07) << 8) \|
73	((chip_addr >> 3) & 0x0F);
74	(u32 ) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL1) =
75	temp;
76
77	/* Issue the read command
78	* (at this moment all other parameters are 0
79	* (size = 1 byte, lane = 0)
80	*/
81
82	(u32 ) (CFG_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2) =
83	(I2C_CNTRL2_START);
84
85	/* Wait until operation completed */
86	do {
87	/* Read I2C operation status */
88	temp =
89	(u32 ) (CFG_TSI108_CSR_BASE + chan_offset +
90	I2C_CNTRL2);
91
92	if (0 ==
93	(temp & (I2C_CNTRL2_RD_STATUS \| I2C_CNTRL2_START)))
94	{
95	if (0 ==
96	(temp &
97	(I2C_CNTRL2_I2C_CFGERR \|
98	I2C_CNTRL2_I2C_TO_ERR))
99	) {
100	op_status = TSI108_I2C_SUCCESS;
101
102	temp = (u32 ) (CFG_TSI108_CSR_BASE +
103	chan_offset +
104	I2C_RD_DATA);
105
106	*buffer = (u8) (temp & 0xFF);
107	} else {
108	/* report HW error */
109	op_status = TSI108_I2C_IF_ERROR;
110
111	DPRINT(("I2C HW error reported: 0x%02x\n", temp));
112	}
113
114	break;
115	}
116	} while (to_count--);
117	} else {
118	op_status = TSI108_I2C_IF_BUSY;
119
120	DPRINT(("I2C Transaction start failed: 0x%02x\n", temp));
121	}
122
123	DPRINT(("I2C read_byte() status: 0x%02x\n", op_status));
124	return op_status;
125	}
126
127	/*
128	* I2C Read interface as defined in "include/i2c.h" :
129	* chip_addr: I2C chip address, range 0..127
130	* (to read from SPD channel EEPROM use (0xD0 ... 0xD7)
131	* NOTE: The bit 7 in the chip_addr serves as a channel select.
132	* This hack is for enabling "isdram" command on Tsi108 boards
133	* without changes to common code. Used for I2C reads only.
134	* byte_addr: Memory or register address within the chip
135	* alen: Number of bytes to use for addr (typically 1, 2 for larger
136	* memories, 0 for register type devices with only one
137	* register)
138	* buffer: Pointer to destination buffer for data to be read
139	* len: How many bytes to read
140	*
141	* Returns: 0 on success, not 0 on failure
142	*/
143
144	int i2c_read(uchar chip_addr, uint byte_addr, int alen, uchar * buffer, int len)
145	{
146	u32 op_status = TSI108_I2C_PARAM_ERR;
147	u32 i2c_if = 0;
148
149	/* Hack to support second (SPD) I2C controller (SPD EEPROM read only).*/
150	if (0xD0 == (chip_addr & ~0x07)) {
151	i2c_if = 1;
152	chip_addr &= 0x7F;
153	}
154	/* Check for valid I2C address */
155	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
156	while (len--) {
157	op_status =
158	i2c_read_byte(i2c_if, chip_addr, byte_addr++,
159	buffer++);
160
161	if (TSI108_I2C_SUCCESS != op_status) {
162	DPRINT(("I2C read_byte() failed: 0x%02x (%d left)\n", op_status, len));
163
164	break;
165	}
166	}
167	}
168
169	DPRINT(("I2C read() status: 0x%02x\n", op_status));
170	return op_status;
171	}
172
173	/* I2C write helper function */
174
175	static int i2c_write_byte(uchar chip_addr,/* I2C device address on the bus */
176	uint byte_addr, /* Byte address within I2C device */
177	uchar * buffer /* pointer to data buffer */
178	)
179	{
180	u32 temp;
181	u32 to_count = I2C_DELAY;
182	u32 op_status = TSI108_I2C_TIMEOUT_ERR;
183
184	/* Check if I2C operation is in progress */
185	temp = (u32 ) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2);
186
187	if (0 ==
188	(temp &
189	(I2C_CNTRL2_RD_STATUS \| I2C_CNTRL2_WR_STATUS \| I2C_CNTRL2_START)))
190	{
191	/* Place data into the I2C Tx Register */
192	(u32 ) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
193	I2C_TX_DATA) = (u32) * buffer;
194
195	/* Set device address and operation */
196	temp =
197	I2C_CNTRL1_I2CWRITE \| (byte_addr << 16) \|
198	((chip_addr & 0x07) << 8) \| ((chip_addr >> 3) & 0x0F);
199	(u32 ) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
200	I2C_CNTRL1) = temp;
201
202	/* Issue the write command (at this moment all other parameters
203	* are 0 (size = 1 byte, lane = 0)
204	*/
205
206	(u32 ) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
207	I2C_CNTRL2) = (I2C_CNTRL2_START);
208
209	op_status = TSI108_I2C_TIMEOUT_ERR;
210
211	/* Wait until operation completed */
212	do {
213	// Read I2C operation status
214	temp =
215	(u32 ) (CFG_TSI108_CSR_BASE + TSI108_I2C_OFFSET +
216	I2C_CNTRL2);
217
218	if (0 ==
219	(temp & (I2C_CNTRL2_WR_STATUS \| I2C_CNTRL2_START)))
220	{
221	if (0 ==
222	(temp &
223	(I2C_CNTRL2_I2C_CFGERR \|
224	I2C_CNTRL2_I2C_TO_ERR))) {
225	op_status = TSI108_I2C_SUCCESS;
226	} else {
227	/* report detected HW error */
228	op_status = TSI108_I2C_IF_ERROR;
229
230	DPRINT(("I2C HW error reported: 0x%02x\n", temp));
231	}
232
233	break;
234	}
235
236	} while (to_count--);
237	} else {
238	op_status = TSI108_I2C_IF_BUSY;
239
240	DPRINT(("I2C Transaction start failed: 0x%02x\n", temp));
241	}
242
243	return op_status;
244	}
245
246	/*
247	* I2C Write interface as defined in "include/i2c.h" :
248	* chip_addr: I2C chip address, range 0..127
249	* byte_addr: Memory or register address within the chip
250	* alen: Number of bytes to use for addr (typically 1, 2 for larger
251	* memories, 0 for register type devices with only one
252	* register)
253	* buffer: Pointer to data to be written
254	* len: How many bytes to write
255	*
256	* Returns: 0 on success, not 0 on failure
257	*/
258
259	int i2c_write(uchar chip_addr, uint byte_addr, int alen, uchar * buffer,
260	int len)
261	{
262	u32 op_status = TSI108_I2C_PARAM_ERR;
263
264	/* Check for valid I2C address */
265	if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) {
266	while (len--) {
267	op_status =
268	i2c_write_byte(chip_addr, byte_addr++, buffer++);
269
270	if (TSI108_I2C_SUCCESS != op_status) {
271	DPRINT(("I2C write_byte() failed: 0x%02x (%d left)\n", op_status, len));
272
273	break;
274	}
275	}
276	}
277
278	return op_status;
279	}
280
281	/*
282	* I2C interface function as defined in "include/i2c.h".
283	* Probe the given I2C chip address by reading single byte from offset 0.
284	* Returns 0 if a chip responded, not 0 on failure.
285	*/
286
287	int i2c_probe(uchar chip)
288	{
289	u32 tmp;
290
291	/*
292	* Try to read the first location of the chip.
293	* The Tsi108 HW doesn't support sending just the chip address
294	* and checkong for an <ACK> back.
295	*/
296	return i2c_read(chip, 0, 1, (char *)&tmp, 1);
297	}
298
299	#endif /* (CONFIG_COMMANDS & CFG_CMD_I2C) */
300	#endif /* CONFIG_TSI108_I2C */