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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> | |
ee311214 | 26 | #include <common.h> |
b825f158 | 27 | |
b825f158 | 28 | #include <tsi108.h> |
29 | ||
cb51c0bf | 30 | #if defined(CONFIG_CMD_I2C) |
b825f158 | 31 | |
ee311214 | 32 | #define I2C_DELAY 100000 |
b825f158 | 33 | #undef DEBUG_I2C |
34 | ||
35 | #ifdef DEBUG_I2C | |
ee311214 | 36 | #define DPRINT(x) printf (x) |
b825f158 | 37 | #else |
38 | #define DPRINT(x) | |
39 | #endif | |
40 | ||
41 | /* All functions assume that Tsi108 I2C block is the only master on the bus */ | |
42 | /* I2C read helper function */ | |
43 | ||
f0722ee7 PT |
44 | void i2c_init(int speed, int slaveaddr) |
45 | { | |
46 | /* | |
47 | * The TSI108 has a fixed I2C clock rate and doesn't support slave | |
48 | * operation. This function only exists as a stub to fit into the | |
49 | * U-Boot I2C API. | |
50 | */ | |
51 | } | |
52 | ||
ee311214 | 53 | static int i2c_read_byte ( |
b825f158 | 54 | uint i2c_chan, /* I2C channel number: 0 - main, 1 - SDC SPD */ |
55 | uchar chip_addr,/* I2C device address on the bus */ | |
56 | uint byte_addr, /* Byte address within I2C device */ | |
57 | uchar * buffer /* pointer to data buffer */ | |
58 | ) | |
59 | { | |
60 | u32 temp; | |
61 | u32 to_count = I2C_DELAY; | |
62 | u32 op_status = TSI108_I2C_TIMEOUT_ERR; | |
63 | u32 chan_offset = TSI108_I2C_OFFSET; | |
64 | ||
ee311214 | 65 | DPRINT (("I2C read_byte() %d 0x%02x 0x%02x\n", |
b825f158 | 66 | i2c_chan, chip_addr, byte_addr)); |
67 | ||
ee311214 | 68 | if (0 != i2c_chan) |
b825f158 | 69 | chan_offset = TSI108_I2C_SDRAM_OFFSET; |
b825f158 | 70 | |
71 | /* Check if I2C operation is in progress */ | |
6d0f6bcf | 72 | temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2); |
b825f158 | 73 | |
74 | if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS | | |
ee311214 | 75 | I2C_CNTRL2_START))) { |
b825f158 | 76 | /* Set device address and operation (read = 0) */ |
77 | temp = (byte_addr << 16) | ((chip_addr & 0x07) << 8) | | |
78 | ((chip_addr >> 3) & 0x0F); | |
6d0f6bcf | 79 | *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL1) = |
b825f158 | 80 | temp; |
81 | ||
82 | /* Issue the read command | |
ee311214 | 83 | * (at this moment all other parameters are 0 |
b825f158 | 84 | * (size = 1 byte, lane = 0) |
85 | */ | |
86 | ||
6d0f6bcf | 87 | *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2) = |
b825f158 | 88 | (I2C_CNTRL2_START); |
89 | ||
90 | /* Wait until operation completed */ | |
91 | do { | |
92 | /* Read I2C operation status */ | |
6d0f6bcf | 93 | temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + chan_offset + I2C_CNTRL2); |
647d3c3e WD |
94 | |
95 | if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_START))) { | |
96 | if (0 == (temp & | |
b825f158 | 97 | (I2C_CNTRL2_I2C_CFGERR | |
98 | I2C_CNTRL2_I2C_TO_ERR)) | |
99 | ) { | |
100 | op_status = TSI108_I2C_SUCCESS; | |
101 | ||
6d0f6bcf | 102 | temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + |
b825f158 | 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 | ||
ee311214 | 111 | DPRINT (("I2C HW error reported: 0x%02x\n", temp)); |
b825f158 | 112 | } |
113 | ||
114 | break; | |
115 | } | |
116 | } while (to_count--); | |
117 | } else { | |
118 | op_status = TSI108_I2C_IF_BUSY; | |
119 | ||
ee311214 | 120 | DPRINT (("I2C Transaction start failed: 0x%02x\n", temp)); |
b825f158 | 121 | } |
122 | ||
ee311214 | 123 | DPRINT (("I2C read_byte() status: 0x%02x\n", op_status)); |
b825f158 | 124 | return op_status; |
125 | } | |
126 | ||
ee311214 | 127 | /* |
b825f158 | 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. | |
0f89c54b | 132 | * This hack is for enabling "i2c sdram" command on Tsi108 boards |
ee311214 | 133 | * without changes to common code. Used for I2C reads only. |
b825f158 | 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 | ||
ee311214 | 144 | int i2c_read (uchar chip_addr, uint byte_addr, int alen, |
145 | uchar * buffer, int len) | |
b825f158 | 146 | { |
147 | u32 op_status = TSI108_I2C_PARAM_ERR; | |
148 | u32 i2c_if = 0; | |
149 | ||
150 | /* Hack to support second (SPD) I2C controller (SPD EEPROM read only).*/ | |
151 | if (0xD0 == (chip_addr & ~0x07)) { | |
152 | i2c_if = 1; | |
153 | chip_addr &= 0x7F; | |
154 | } | |
155 | /* Check for valid I2C address */ | |
156 | if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) { | |
157 | while (len--) { | |
647d3c3e | 158 | op_status = i2c_read_byte(i2c_if, chip_addr, byte_addr++, buffer++); |
b825f158 | 159 | |
160 | if (TSI108_I2C_SUCCESS != op_status) { | |
ee311214 | 161 | DPRINT (("I2C read_byte() failed: 0x%02x (%d left)\n", op_status, len)); |
b825f158 | 162 | |
163 | break; | |
164 | } | |
165 | } | |
166 | } | |
167 | ||
ee311214 | 168 | DPRINT (("I2C read() status: 0x%02x\n", op_status)); |
b825f158 | 169 | return op_status; |
170 | } | |
171 | ||
172 | /* I2C write helper function */ | |
173 | ||
ee311214 | 174 | static int i2c_write_byte (uchar chip_addr,/* I2C device address on the bus */ |
b825f158 | 175 | uint byte_addr, /* Byte address within I2C device */ |
176 | uchar * buffer /* pointer to data buffer */ | |
177 | ) | |
178 | { | |
179 | u32 temp; | |
180 | u32 to_count = I2C_DELAY; | |
181 | u32 op_status = TSI108_I2C_TIMEOUT_ERR; | |
182 | ||
183 | /* Check if I2C operation is in progress */ | |
6d0f6bcf | 184 | temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2); |
b825f158 | 185 | |
647d3c3e | 186 | if (0 == (temp & (I2C_CNTRL2_RD_STATUS | I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START))) { |
b825f158 | 187 | /* Place data into the I2C Tx Register */ |
6d0f6bcf | 188 | *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + |
b825f158 | 189 | I2C_TX_DATA) = (u32) * buffer; |
190 | ||
191 | /* Set device address and operation */ | |
192 | temp = | |
193 | I2C_CNTRL1_I2CWRITE | (byte_addr << 16) | | |
194 | ((chip_addr & 0x07) << 8) | ((chip_addr >> 3) & 0x0F); | |
6d0f6bcf | 195 | *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + |
b825f158 | 196 | I2C_CNTRL1) = temp; |
197 | ||
198 | /* Issue the write command (at this moment all other parameters | |
199 | * are 0 (size = 1 byte, lane = 0) | |
200 | */ | |
647d3c3e | 201 | |
6d0f6bcf | 202 | *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + |
b825f158 | 203 | I2C_CNTRL2) = (I2C_CNTRL2_START); |
204 | ||
205 | op_status = TSI108_I2C_TIMEOUT_ERR; | |
206 | ||
207 | /* Wait until operation completed */ | |
208 | do { | |
ee311214 | 209 | /* Read I2C operation status */ |
6d0f6bcf | 210 | temp = *(u32 *) (CONFIG_SYS_TSI108_CSR_BASE + TSI108_I2C_OFFSET + I2C_CNTRL2); |
647d3c3e WD |
211 | |
212 | if (0 == (temp & (I2C_CNTRL2_WR_STATUS | I2C_CNTRL2_START))) { | |
213 | if (0 == (temp & | |
b825f158 | 214 | (I2C_CNTRL2_I2C_CFGERR | |
215 | I2C_CNTRL2_I2C_TO_ERR))) { | |
216 | op_status = TSI108_I2C_SUCCESS; | |
217 | } else { | |
218 | /* report detected HW error */ | |
219 | op_status = TSI108_I2C_IF_ERROR; | |
220 | ||
ee311214 | 221 | DPRINT (("I2C HW error reported: 0x%02x\n", temp)); |
b825f158 | 222 | } |
223 | ||
224 | break; | |
225 | } | |
226 | ||
227 | } while (to_count--); | |
228 | } else { | |
229 | op_status = TSI108_I2C_IF_BUSY; | |
230 | ||
ee311214 | 231 | DPRINT (("I2C Transaction start failed: 0x%02x\n", temp)); |
b825f158 | 232 | } |
233 | ||
234 | return op_status; | |
235 | } | |
236 | ||
ee311214 | 237 | /* |
b825f158 | 238 | * I2C Write interface as defined in "include/i2c.h" : |
239 | * chip_addr: I2C chip address, range 0..127 | |
240 | * byte_addr: Memory or register address within the chip | |
241 | * alen: Number of bytes to use for addr (typically 1, 2 for larger | |
242 | * memories, 0 for register type devices with only one | |
243 | * register) | |
244 | * buffer: Pointer to data to be written | |
245 | * len: How many bytes to write | |
246 | * | |
247 | * Returns: 0 on success, not 0 on failure | |
248 | */ | |
249 | ||
ee311214 | 250 | int i2c_write (uchar chip_addr, uint byte_addr, int alen, uchar * buffer, |
b825f158 | 251 | int len) |
252 | { | |
253 | u32 op_status = TSI108_I2C_PARAM_ERR; | |
254 | ||
255 | /* Check for valid I2C address */ | |
256 | if (chip_addr <= 0x7F && (byte_addr + len) <= (0x01 << (alen * 8))) { | |
257 | while (len--) { | |
258 | op_status = | |
ee311214 | 259 | i2c_write_byte (chip_addr, byte_addr++, buffer++); |
b825f158 | 260 | |
261 | if (TSI108_I2C_SUCCESS != op_status) { | |
ee311214 | 262 | DPRINT (("I2C write_byte() failed: 0x%02x (%d left)\n", op_status, len)); |
b825f158 | 263 | |
264 | break; | |
265 | } | |
266 | } | |
267 | } | |
268 | ||
269 | return op_status; | |
270 | } | |
271 | ||
ee311214 | 272 | /* |
b825f158 | 273 | * I2C interface function as defined in "include/i2c.h". |
274 | * Probe the given I2C chip address by reading single byte from offset 0. | |
275 | * Returns 0 if a chip responded, not 0 on failure. | |
276 | */ | |
277 | ||
ee311214 | 278 | int i2c_probe (uchar chip) |
b825f158 | 279 | { |
280 | u32 tmp; | |
281 | ||
282 | /* | |
283 | * Try to read the first location of the chip. | |
284 | * The Tsi108 HW doesn't support sending just the chip address | |
285 | * and checkong for an <ACK> back. | |
286 | */ | |
409ecdc0 | 287 | return i2c_read (chip, 0, 1, (uchar *)&tmp, 1); |
b825f158 | 288 | } |
289 | ||
cb51c0bf | 290 | #endif |