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3863585b WD |
1 | /* |
2 | * (C) Copyright 2000, 2001 | |
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 | */ | |
24 | ||
d4f5c728 | 25 | /* |
26 | * Support for read and write access to EEPROM like memory devices. This | |
27 | * includes regular EEPROM as well as FRAM (ferroelectic nonvolaile RAM). | |
28 | * FRAM devices read and write data at bus speed. In particular, there is no | |
29 | * write delay. Also, there is no limit imposed on the numer of bytes that can | |
30 | * be transferred with a single read or write. | |
6617aae9 | 31 | * |
d4f5c728 | 32 | * Use the following configuration options to ensure no unneeded performance |
33 | * degradation (typical for EEPROM) is incured for FRAM memory: | |
6617aae9 | 34 | * |
d4f5c728 | 35 | * #define CFG_I2C_FRAM |
36 | * #undef CFG_EEPROM_PAGE_WRITE_DELAY_MS | |
37 | * | |
38 | */ | |
39 | ||
3863585b WD |
40 | #include <common.h> |
41 | #include <config.h> | |
42 | #include <command.h> | |
43 | #include <i2c.h> | |
44 | ||
3863585b WD |
45 | extern void eeprom_init (void); |
46 | extern int eeprom_read (unsigned dev_addr, unsigned offset, | |
47 | uchar *buffer, unsigned cnt); | |
48 | extern int eeprom_write (unsigned dev_addr, unsigned offset, | |
49 | uchar *buffer, unsigned cnt); | |
98f4a3df SR |
50 | #if defined(CFG_EEPROM_WREN) |
51 | extern int eeprom_write_enable (unsigned dev_addr, int state); | |
52 | #endif | |
3863585b WD |
53 | |
54 | ||
55 | #if defined(CFG_EEPROM_X40430) | |
56 | /* Maximum number of times to poll for acknowledge after write */ | |
57 | #define MAX_ACKNOWLEDGE_POLLS 10 | |
58 | #endif | |
59 | ||
60 | /* ------------------------------------------------------------------------- */ | |
61 | ||
baa26db4 | 62 | #if defined(CONFIG_CMD_EEPROM) |
3863585b WD |
63 | int do_eeprom ( cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]) |
64 | { | |
65 | const char *const fmt = | |
66 | "\nEEPROM @0x%lX %s: addr %08lx off %04lx count %ld ... "; | |
67 | ||
68 | #if defined(CFG_I2C_MULTI_EEPROMS) | |
69 | if (argc == 6) { | |
70 | ulong dev_addr = simple_strtoul (argv[2], NULL, 16); | |
71 | ulong addr = simple_strtoul (argv[3], NULL, 16); | |
72 | ulong off = simple_strtoul (argv[4], NULL, 16); | |
73 | ulong cnt = simple_strtoul (argv[5], NULL, 16); | |
74 | #else | |
75 | if (argc == 5) { | |
76 | ulong dev_addr = CFG_DEF_EEPROM_ADDR; | |
77 | ulong addr = simple_strtoul (argv[2], NULL, 16); | |
78 | ulong off = simple_strtoul (argv[3], NULL, 16); | |
79 | ulong cnt = simple_strtoul (argv[4], NULL, 16); | |
80 | #endif /* CFG_I2C_MULTI_EEPROMS */ | |
81 | ||
82 | # ifndef CONFIG_SPI | |
83 | eeprom_init (); | |
84 | # endif /* !CONFIG_SPI */ | |
85 | ||
86 | if (strcmp (argv[1], "read") == 0) { | |
87 | int rcode; | |
88 | ||
89 | printf (fmt, dev_addr, argv[1], addr, off, cnt); | |
90 | ||
91 | rcode = eeprom_read (dev_addr, off, (uchar *) addr, cnt); | |
92 | ||
4b9206ed | 93 | puts ("done\n"); |
3863585b WD |
94 | return rcode; |
95 | } else if (strcmp (argv[1], "write") == 0) { | |
96 | int rcode; | |
97 | ||
98 | printf (fmt, dev_addr, argv[1], addr, off, cnt); | |
99 | ||
100 | rcode = eeprom_write (dev_addr, off, (uchar *) addr, cnt); | |
101 | ||
4b9206ed | 102 | puts ("done\n"); |
3863585b WD |
103 | return rcode; |
104 | } | |
105 | } | |
106 | ||
107 | printf ("Usage:\n%s\n", cmdtp->usage); | |
108 | return 1; | |
109 | } | |
90253178 | 110 | #endif |
3863585b WD |
111 | |
112 | /*----------------------------------------------------------------------- | |
113 | * | |
114 | * for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is | |
115 | * 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM. | |
116 | * | |
117 | * for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is | |
118 | * 0x00000nxx for EEPROM address selectors and page number at n. | |
119 | */ | |
120 | ||
3863585b WD |
121 | #ifndef CONFIG_SPI |
122 | #if !defined(CFG_I2C_EEPROM_ADDR_LEN) || CFG_I2C_EEPROM_ADDR_LEN < 1 || CFG_I2C_EEPROM_ADDR_LEN > 2 | |
123 | #error CFG_I2C_EEPROM_ADDR_LEN must be 1 or 2 | |
124 | #endif | |
125 | #endif | |
126 | ||
127 | int eeprom_read (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt) | |
128 | { | |
129 | unsigned end = offset + cnt; | |
130 | unsigned blk_off; | |
131 | int rcode = 0; | |
132 | ||
133 | /* Read data until done or would cross a page boundary. | |
134 | * We must write the address again when changing pages | |
135 | * because the next page may be in a different device. | |
136 | */ | |
137 | while (offset < end) { | |
d4f5c728 | 138 | unsigned alen, len; |
139 | #if !defined(CFG_I2C_FRAM) | |
140 | unsigned maxlen; | |
141 | #endif | |
142 | ||
3863585b WD |
143 | #if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X) |
144 | uchar addr[2]; | |
145 | ||
146 | blk_off = offset & 0xFF; /* block offset */ | |
147 | ||
148 | addr[0] = offset >> 8; /* block number */ | |
149 | addr[1] = blk_off; /* block offset */ | |
150 | alen = 2; | |
151 | #else | |
152 | uchar addr[3]; | |
153 | ||
154 | blk_off = offset & 0xFF; /* block offset */ | |
155 | ||
156 | addr[0] = offset >> 16; /* block number */ | |
157 | addr[1] = offset >> 8; /* upper address octet */ | |
158 | addr[2] = blk_off; /* lower address octet */ | |
159 | alen = 3; | |
160 | #endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */ | |
161 | ||
162 | addr[0] |= dev_addr; /* insert device address */ | |
163 | ||
d4f5c728 | 164 | len = end - offset; |
165 | ||
166 | /* | |
167 | * For a FRAM device there is no limit on the number of the | |
168 | * bytes that can be ccessed with the single read or write | |
169 | * operation. | |
170 | */ | |
171 | #if !defined(CFG_I2C_FRAM) | |
3863585b WD |
172 | maxlen = 0x100 - blk_off; |
173 | if (maxlen > I2C_RXTX_LEN) | |
174 | maxlen = I2C_RXTX_LEN; | |
3863585b WD |
175 | if (len > maxlen) |
176 | len = maxlen; | |
d4f5c728 | 177 | #endif |
178 | ||
3863585b WD |
179 | #ifdef CONFIG_SPI |
180 | spi_read (addr, alen, buffer, len); | |
181 | #else | |
182 | if (i2c_read (addr[0], offset, alen-1, buffer, len) != 0) | |
183 | rcode = 1; | |
184 | #endif | |
185 | buffer += len; | |
186 | offset += len; | |
187 | } | |
d4f5c728 | 188 | |
3863585b WD |
189 | return rcode; |
190 | } | |
191 | ||
192 | /*----------------------------------------------------------------------- | |
193 | * | |
194 | * for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is | |
195 | * 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM. | |
196 | * | |
197 | * for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is | |
198 | * 0x00000nxx for EEPROM address selectors and page number at n. | |
199 | */ | |
200 | ||
201 | int eeprom_write (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt) | |
202 | { | |
203 | unsigned end = offset + cnt; | |
204 | unsigned blk_off; | |
205 | int rcode = 0; | |
206 | ||
207 | #if defined(CFG_EEPROM_X40430) | |
208 | uchar contr_r_addr[2]; | |
209 | uchar addr_void[2]; | |
210 | uchar contr_reg[2]; | |
211 | uchar ctrl_reg_v; | |
212 | int i; | |
213 | #endif | |
214 | ||
98f4a3df SR |
215 | #if defined(CFG_EEPROM_WREN) |
216 | eeprom_write_enable (dev_addr,1); | |
217 | #endif | |
3863585b WD |
218 | /* Write data until done or would cross a write page boundary. |
219 | * We must write the address again when changing pages | |
220 | * because the address counter only increments within a page. | |
221 | */ | |
222 | ||
223 | while (offset < end) { | |
d4f5c728 | 224 | unsigned alen, len; |
225 | #if !defined(CFG_I2C_FRAM) | |
226 | unsigned maxlen; | |
227 | #endif | |
228 | ||
3863585b WD |
229 | #if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X) |
230 | uchar addr[2]; | |
231 | ||
232 | blk_off = offset & 0xFF; /* block offset */ | |
233 | ||
234 | addr[0] = offset >> 8; /* block number */ | |
235 | addr[1] = blk_off; /* block offset */ | |
236 | alen = 2; | |
237 | #else | |
238 | uchar addr[3]; | |
239 | ||
240 | blk_off = offset & 0xFF; /* block offset */ | |
241 | ||
242 | addr[0] = offset >> 16; /* block number */ | |
243 | addr[1] = offset >> 8; /* upper address octet */ | |
244 | addr[2] = blk_off; /* lower address octet */ | |
245 | alen = 3; | |
246 | #endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */ | |
247 | ||
248 | addr[0] |= dev_addr; /* insert device address */ | |
249 | ||
d4f5c728 | 250 | len = end - offset; |
251 | ||
252 | /* | |
253 | * For a FRAM device there is no limit on the number of the | |
254 | * bytes that can be ccessed with the single read or write | |
255 | * operation. | |
256 | */ | |
257 | #if !defined(CFG_I2C_FRAM) | |
258 | ||
3863585b WD |
259 | #if defined(CFG_EEPROM_PAGE_WRITE_BITS) |
260 | ||
261 | #define EEPROM_PAGE_SIZE (1 << CFG_EEPROM_PAGE_WRITE_BITS) | |
262 | #define EEPROM_PAGE_OFFSET(x) ((x) & (EEPROM_PAGE_SIZE - 1)) | |
263 | ||
264 | maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off); | |
265 | #else | |
266 | maxlen = 0x100 - blk_off; | |
267 | #endif | |
268 | if (maxlen > I2C_RXTX_LEN) | |
269 | maxlen = I2C_RXTX_LEN; | |
270 | ||
3863585b WD |
271 | if (len > maxlen) |
272 | len = maxlen; | |
d4f5c728 | 273 | #endif |
274 | ||
3863585b WD |
275 | #ifdef CONFIG_SPI |
276 | spi_write (addr, alen, buffer, len); | |
277 | #else | |
278 | #if defined(CFG_EEPROM_X40430) | |
279 | /* Get the value of the control register. | |
280 | * Set current address (internal pointer in the x40430) | |
281 | * to 0x1ff. | |
282 | */ | |
283 | contr_r_addr[0] = 9; | |
284 | contr_r_addr[1] = 0xff; | |
285 | addr_void[0] = 0; | |
286 | addr_void[1] = addr[1]; | |
287 | #ifdef CFG_I2C_EEPROM_ADDR | |
288 | contr_r_addr[0] |= CFG_I2C_EEPROM_ADDR; | |
289 | addr_void[0] |= CFG_I2C_EEPROM_ADDR; | |
290 | #endif | |
291 | contr_reg[0] = 0xff; | |
292 | if (i2c_read (contr_r_addr[0], contr_r_addr[1], 1, contr_reg, 1) != 0) { | |
293 | rcode = 1; | |
294 | } | |
295 | ctrl_reg_v = contr_reg[0]; | |
296 | ||
297 | /* Are any of the eeprom blocks write protected? | |
298 | */ | |
299 | if (ctrl_reg_v & 0x18) { | |
300 | ctrl_reg_v &= ~0x18; /* reset block protect bits */ | |
301 | ctrl_reg_v |= 0x02; /* set write enable latch */ | |
302 | ctrl_reg_v &= ~0x04; /* clear RWEL */ | |
303 | ||
304 | /* Set write enable latch. | |
305 | */ | |
306 | contr_reg[0] = 0x02; | |
307 | if (i2c_write (contr_r_addr[0], 0xff, 1, contr_reg, 1) != 0) { | |
308 | rcode = 1; | |
309 | } | |
310 | ||
311 | /* Set register write enable latch. | |
312 | */ | |
313 | contr_reg[0] = 0x06; | |
314 | if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) { | |
315 | rcode = 1; | |
316 | } | |
317 | ||
318 | /* Modify ctrl register. | |
319 | */ | |
320 | contr_reg[0] = ctrl_reg_v; | |
321 | if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) { | |
322 | rcode = 1; | |
323 | } | |
324 | ||
325 | /* The write (above) is an operation on NV memory. | |
326 | * These can take some time (~5ms), and the device | |
327 | * will not respond to further I2C messages till | |
328 | * it's completed the write. | |
329 | * So poll device for an I2C acknowledge. | |
330 | * When we get one we know we can continue with other | |
331 | * operations. | |
332 | */ | |
333 | contr_reg[0] = 0; | |
334 | for (i = 0; i < MAX_ACKNOWLEDGE_POLLS; i++) { | |
aacf9a49 | 335 | if (i2c_read (addr_void[0], addr_void[1], 1, contr_reg, 1) == 0) |
3863585b WD |
336 | break; /* got ack */ |
337 | #if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS) | |
338 | udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000); | |
339 | #endif | |
340 | } | |
341 | if (i == MAX_ACKNOWLEDGE_POLLS) { | |
4b9206ed | 342 | puts ("EEPROM poll acknowledge failed\n"); |
3863585b WD |
343 | rcode = 1; |
344 | } | |
345 | } | |
346 | ||
347 | /* Is the write enable latch on?. | |
348 | */ | |
349 | else if (!(ctrl_reg_v & 0x02)) { | |
350 | /* Set write enable latch. | |
351 | */ | |
352 | contr_reg[0] = 0x02; | |
353 | if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) { | |
354 | rcode = 1; | |
355 | } | |
356 | } | |
357 | /* Write is enabled ... now write eeprom value. | |
358 | */ | |
359 | #endif | |
360 | if (i2c_write (addr[0], offset, alen-1, buffer, len) != 0) | |
361 | rcode = 1; | |
362 | ||
363 | #endif | |
364 | buffer += len; | |
365 | offset += len; | |
366 | ||
367 | #if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS) | |
368 | udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000); | |
369 | #endif | |
370 | } | |
98f4a3df SR |
371 | #if defined(CFG_EEPROM_WREN) |
372 | eeprom_write_enable (dev_addr,0); | |
373 | #endif | |
3863585b WD |
374 | return rcode; |
375 | } | |
376 | ||
6dd652fa WD |
377 | #ifndef CONFIG_SPI |
378 | int | |
379 | eeprom_probe (unsigned dev_addr, unsigned offset) | |
380 | { | |
381 | unsigned char chip; | |
382 | ||
383 | /* Probe the chip address | |
384 | */ | |
385 | #if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X) | |
386 | chip = offset >> 8; /* block number */ | |
387 | #else | |
388 | chip = offset >> 16; /* block number */ | |
389 | #endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */ | |
390 | ||
391 | chip |= dev_addr; /* insert device address */ | |
392 | ||
393 | return (i2c_probe (chip)); | |
394 | } | |
395 | #endif | |
396 | ||
3863585b WD |
397 | /*----------------------------------------------------------------------- |
398 | * Set default values | |
399 | */ | |
400 | #ifndef CFG_I2C_SPEED | |
401 | #define CFG_I2C_SPEED 50000 | |
402 | #endif | |
403 | ||
404 | #ifndef CFG_I2C_SLAVE | |
405 | #define CFG_I2C_SLAVE 0xFE | |
406 | #endif | |
407 | ||
408 | void eeprom_init (void) | |
409 | { | |
410 | #if defined(CONFIG_SPI) | |
411 | spi_init_f (); | |
412 | #endif | |
413 | #if defined(CONFIG_HARD_I2C) || \ | |
414 | defined(CONFIG_SOFT_I2C) | |
415 | i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE); | |
416 | #endif | |
417 | } | |
418 | /*----------------------------------------------------------------------- | |
419 | */ | |
90253178 | 420 | |
8bde7f77 WD |
421 | /***************************************************/ |
422 | ||
baa26db4 | 423 | #if defined(CONFIG_CMD_EEPROM) |
8bde7f77 WD |
424 | |
425 | #ifdef CFG_I2C_MULTI_EEPROMS | |
0d498393 WD |
426 | U_BOOT_CMD( |
427 | eeprom, 6, 1, do_eeprom, | |
8bde7f77 WD |
428 | "eeprom - EEPROM sub-system\n", |
429 | "read devaddr addr off cnt\n" | |
430 | "eeprom write devaddr addr off cnt\n" | |
431 | " - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'\n" | |
432 | ); | |
433 | #else /* One EEPROM */ | |
0d498393 WD |
434 | U_BOOT_CMD( |
435 | eeprom, 5, 1, do_eeprom, | |
8bde7f77 WD |
436 | "eeprom - EEPROM sub-system\n", |
437 | "read addr off cnt\n" | |
438 | "eeprom write addr off cnt\n" | |
439 | " - read/write `cnt' bytes at EEPROM offset `off'\n" | |
440 | ); | |
441 | #endif /* CFG_I2C_MULTI_EEPROMS */ | |
442 | ||
90253178 | 443 | #endif |