efi_driver: EFI block driver
[platform/kernel/u-boot.git] / cmd / eeprom.c
1 /*
2  * (C) Copyright 2000, 2001
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 /*
9  * Support for read and write access to EEPROM like memory devices. This
10  * includes regular EEPROM as well as  FRAM (ferroelectic nonvolaile RAM).
11  * FRAM devices read and write data at bus speed. In particular, there is no
12  * write delay. Also, there is no limit imposed on the number of bytes that can
13  * be transferred with a single read or write.
14  *
15  * Use the following configuration options to ensure no unneeded performance
16  * degradation (typical for EEPROM) is incured for FRAM memory:
17  *
18  * #define CONFIG_SYS_I2C_FRAM
19  * #undef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
20  *
21  */
22
23 #include <common.h>
24 #include <config.h>
25 #include <command.h>
26 #include <i2c.h>
27 #include <eeprom_layout.h>
28
29 #ifndef CONFIG_SYS_I2C_SPEED
30 #define CONFIG_SYS_I2C_SPEED    50000
31 #endif
32
33 #ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
34 #define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS   0
35 #endif
36
37 #ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_BITS
38 #define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS       8
39 #endif
40
41 #ifndef I2C_RXTX_LEN
42 #define I2C_RXTX_LEN    128
43 #endif
44
45 #define EEPROM_PAGE_SIZE        (1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)
46 #define EEPROM_PAGE_OFFSET(x)   ((x) & (EEPROM_PAGE_SIZE - 1))
47
48 /*
49  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
50  *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
51  *
52  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
53  *   0x00000nxx for EEPROM address selectors and page number at n.
54  */
55 #if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
56 #if !defined(CONFIG_SYS_I2C_EEPROM_ADDR_LEN) || \
57         (CONFIG_SYS_I2C_EEPROM_ADDR_LEN < 1) || \
58         (CONFIG_SYS_I2C_EEPROM_ADDR_LEN > 2)
59 #error CONFIG_SYS_I2C_EEPROM_ADDR_LEN must be 1 or 2
60 #endif
61 #endif
62
63 __weak int eeprom_write_enable(unsigned dev_addr, int state)
64 {
65         return 0;
66 }
67
68 void eeprom_init(int bus)
69 {
70         /* SPI EEPROM */
71 #if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
72         spi_init_f();
73 #endif
74
75         /* I2C EEPROM */
76 #if defined(CONFIG_SYS_I2C)
77         if (bus >= 0)
78                 i2c_set_bus_num(bus);
79         i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
80 #endif
81 }
82
83 static int eeprom_addr(unsigned dev_addr, unsigned offset, uchar *addr)
84 {
85         unsigned blk_off;
86         int alen;
87
88         blk_off = offset & 0xff;        /* block offset */
89 #if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1
90         addr[0] = offset >> 8;          /* block number */
91         addr[1] = blk_off;              /* block offset */
92         alen = 2;
93 #else
94         addr[0] = offset >> 16;         /* block number */
95         addr[1] = offset >>  8;         /* upper address octet */
96         addr[2] = blk_off;              /* lower address octet */
97         alen = 3;
98 #endif  /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN */
99
100         addr[0] |= dev_addr;            /* insert device address */
101
102         return alen;
103 }
104
105 static int eeprom_len(unsigned offset, unsigned end)
106 {
107         unsigned len = end - offset;
108
109         /*
110          * For a FRAM device there is no limit on the number of the
111          * bytes that can be ccessed with the single read or write
112          * operation.
113          */
114 #if !defined(CONFIG_SYS_I2C_FRAM)
115         unsigned blk_off = offset & 0xff;
116         unsigned maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);
117
118         if (maxlen > I2C_RXTX_LEN)
119                 maxlen = I2C_RXTX_LEN;
120
121         if (len > maxlen)
122                 len = maxlen;
123 #endif
124
125         return len;
126 }
127
128 static int eeprom_rw_block(unsigned offset, uchar *addr, unsigned alen,
129                            uchar *buffer, unsigned len, bool read)
130 {
131         int ret = 0;
132
133         /* SPI */
134 #if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
135         if (read)
136                 spi_read(addr, alen, buffer, len);
137         else
138                 spi_write(addr, alen, buffer, len);
139 #else   /* I2C */
140
141 #if defined(CONFIG_SYS_I2C_EEPROM_BUS)
142         i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS);
143 #endif
144
145         if (read)
146                 ret = i2c_read(addr[0], offset, alen - 1, buffer, len);
147         else
148                 ret = i2c_write(addr[0], offset, alen - 1, buffer, len);
149
150         if (ret)
151                 ret = 1;
152 #endif
153         return ret;
154 }
155
156 static int eeprom_rw(unsigned dev_addr, unsigned offset, uchar *buffer,
157                      unsigned cnt, bool read)
158 {
159         unsigned end = offset + cnt;
160         unsigned alen, len;
161         int rcode = 0;
162         uchar addr[3];
163
164         while (offset < end) {
165                 alen = eeprom_addr(dev_addr, offset, addr);
166
167                 len = eeprom_len(offset, end);
168
169                 rcode = eeprom_rw_block(offset, addr, alen, buffer, len, read);
170
171                 buffer += len;
172                 offset += len;
173
174                 if (!read)
175                         udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
176         }
177
178         return rcode;
179 }
180
181 int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
182 {
183         /*
184          * Read data until done or would cross a page boundary.
185          * We must write the address again when changing pages
186          * because the next page may be in a different device.
187          */
188         return eeprom_rw(dev_addr, offset, buffer, cnt, 1);
189 }
190
191 int eeprom_write(unsigned dev_addr, unsigned offset,
192                  uchar *buffer, unsigned cnt)
193 {
194         int ret;
195
196         eeprom_write_enable(dev_addr, 1);
197
198         /*
199          * Write data until done or would cross a write page boundary.
200          * We must write the address again when changing pages
201          * because the address counter only increments within a page.
202          */
203         ret = eeprom_rw(dev_addr, offset, buffer, cnt, 0);
204
205         eeprom_write_enable(dev_addr, 0);
206         return ret;
207 }
208
209 static int parse_numeric_param(char *str)
210 {
211         char *endptr;
212         int value = simple_strtol(str, &endptr, 16);
213
214         return (*endptr != '\0') ? -1 : value;
215 }
216
217 /**
218  * parse_i2c_bus_addr - parse the i2c bus and i2c devaddr parameters
219  *
220  * @i2c_bus:    address to store the i2c bus
221  * @i2c_addr:   address to store the device i2c address
222  * @argc:       count of command line arguments left to parse
223  * @argv:       command line arguments left to parse
224  * @argc_no_bus_addr:   argc value we expect to see when bus & addr aren't given
225  *
226  * @returns:    number of arguments parsed or CMD_RET_USAGE if error
227  */
228 static int parse_i2c_bus_addr(int *i2c_bus, ulong *i2c_addr, int argc,
229                               char * const argv[], int argc_no_bus_addr)
230 {
231         int argc_no_bus = argc_no_bus_addr + 1;
232         int argc_bus_addr = argc_no_bus_addr + 2;
233
234 #ifdef CONFIG_SYS_DEF_EEPROM_ADDR
235         if (argc == argc_no_bus_addr) {
236                 *i2c_bus = -1;
237                 *i2c_addr = CONFIG_SYS_DEF_EEPROM_ADDR;
238
239                 return 0;
240         }
241 #endif
242         if (argc == argc_no_bus) {
243                 *i2c_bus = -1;
244                 *i2c_addr = parse_numeric_param(argv[0]);
245
246                 return 1;
247         }
248
249         if (argc == argc_bus_addr) {
250                 *i2c_bus = parse_numeric_param(argv[0]);
251                 *i2c_addr = parse_numeric_param(argv[1]);
252
253                 return 2;
254         }
255
256         return CMD_RET_USAGE;
257 }
258
259 #ifdef CONFIG_CMD_EEPROM_LAYOUT
260
261 __weak int eeprom_parse_layout_version(char *str)
262 {
263         return LAYOUT_VERSION_UNRECOGNIZED;
264 }
265
266 static unsigned char eeprom_buf[CONFIG_SYS_EEPROM_SIZE];
267
268 #endif
269
270 enum eeprom_action {
271         EEPROM_READ,
272         EEPROM_WRITE,
273         EEPROM_PRINT,
274         EEPROM_UPDATE,
275         EEPROM_ACTION_INVALID,
276 };
277
278 static enum eeprom_action parse_action(char *cmd)
279 {
280         if (!strncmp(cmd, "read", 4))
281                 return EEPROM_READ;
282         if (!strncmp(cmd, "write", 5))
283                 return EEPROM_WRITE;
284 #ifdef CONFIG_CMD_EEPROM_LAYOUT
285         if (!strncmp(cmd, "print", 5))
286                 return EEPROM_PRINT;
287         if (!strncmp(cmd, "update", 6))
288                 return EEPROM_UPDATE;
289 #endif
290
291         return EEPROM_ACTION_INVALID;
292 }
293
294 static int eeprom_execute_command(enum eeprom_action action, int i2c_bus,
295                                   ulong i2c_addr, int layout_ver, char *key,
296                                   char *value, ulong addr, ulong off, ulong cnt)
297 {
298         int rcode = 0;
299         const char *const fmt =
300                 "\nEEPROM @0x%lX %s: addr %08lx  off %04lx  count %ld ... ";
301 #ifdef CONFIG_CMD_EEPROM_LAYOUT
302         struct eeprom_layout layout;
303 #endif
304
305         if (action == EEPROM_ACTION_INVALID)
306                 return CMD_RET_USAGE;
307
308         eeprom_init(i2c_bus);
309         if (action == EEPROM_READ) {
310                 printf(fmt, i2c_addr, "read", addr, off, cnt);
311
312                 rcode = eeprom_read(i2c_addr, off, (uchar *)addr, cnt);
313
314                 puts("done\n");
315                 return rcode;
316         } else if (action == EEPROM_WRITE) {
317                 printf(fmt, i2c_addr, "write", addr, off, cnt);
318
319                 rcode = eeprom_write(i2c_addr, off, (uchar *)addr, cnt);
320
321                 puts("done\n");
322                 return rcode;
323         }
324
325 #ifdef CONFIG_CMD_EEPROM_LAYOUT
326         rcode = eeprom_read(i2c_addr, 0, eeprom_buf, CONFIG_SYS_EEPROM_SIZE);
327         if (rcode < 0)
328                 return rcode;
329
330         eeprom_layout_setup(&layout, eeprom_buf, CONFIG_SYS_EEPROM_SIZE,
331                             layout_ver);
332
333         if (action == EEPROM_PRINT) {
334                 layout.print(&layout);
335                 return 0;
336         }
337
338         layout.update(&layout, key, value);
339
340         rcode = eeprom_write(i2c_addr, 0, layout.data, CONFIG_SYS_EEPROM_SIZE);
341 #endif
342
343         return rcode;
344 }
345
346 #define NEXT_PARAM(argc, index) { (argc)--; (index)++; }
347 int do_eeprom(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
348 {
349         int layout_ver = LAYOUT_VERSION_AUTODETECT;
350         enum eeprom_action action = EEPROM_ACTION_INVALID;
351         int i2c_bus = -1, index = 0;
352         ulong i2c_addr = -1, addr = 0, cnt = 0, off = 0;
353         int ret;
354         char *field_name = "";
355         char *field_value = "";
356
357         if (argc <= 1)
358                 return CMD_RET_USAGE;
359
360         NEXT_PARAM(argc, index); /* Skip program name */
361
362         action = parse_action(argv[index]);
363         NEXT_PARAM(argc, index);
364
365         if (action == EEPROM_ACTION_INVALID)
366                 return CMD_RET_USAGE;
367
368 #ifdef CONFIG_CMD_EEPROM_LAYOUT
369         if (action == EEPROM_PRINT || action == EEPROM_UPDATE) {
370                 if (!strcmp(argv[index], "-l")) {
371                         NEXT_PARAM(argc, index);
372                         layout_ver = eeprom_parse_layout_version(argv[index]);
373                         NEXT_PARAM(argc, index);
374                 }
375         }
376 #endif
377
378         switch (action) {
379         case EEPROM_READ:
380         case EEPROM_WRITE:
381                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
382                                          argv + index, 3);
383                 break;
384         case EEPROM_PRINT:
385                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
386                                          argv + index, 0);
387                 break;
388         case EEPROM_UPDATE:
389                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
390                                          argv + index, 2);
391                 break;
392         default:
393                 /* Get compiler to stop whining */
394                 return CMD_RET_USAGE;
395         }
396
397         if (ret == CMD_RET_USAGE)
398                 return ret;
399
400         while (ret--)
401                 NEXT_PARAM(argc, index);
402
403         if (action == EEPROM_READ || action == EEPROM_WRITE) {
404                 addr = parse_numeric_param(argv[index]);
405                 NEXT_PARAM(argc, index);
406                 off = parse_numeric_param(argv[index]);
407                 NEXT_PARAM(argc, index);
408                 cnt = parse_numeric_param(argv[index]);
409         }
410
411 #ifdef CONFIG_CMD_EEPROM_LAYOUT
412         if (action == EEPROM_UPDATE) {
413                 field_name = argv[index];
414                 NEXT_PARAM(argc, index);
415                 field_value = argv[index];
416                 NEXT_PARAM(argc, index);
417         }
418 #endif
419
420         return eeprom_execute_command(action, i2c_bus, i2c_addr, layout_ver,
421                                       field_name, field_value, addr, off, cnt);
422 }
423
424 U_BOOT_CMD(
425         eeprom, 8,      1,      do_eeprom,
426         "EEPROM sub-system",
427         "read  <bus> <devaddr> addr off cnt\n"
428         "eeprom write <bus> <devaddr> addr off cnt\n"
429         "       - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'"
430 #ifdef CONFIG_CMD_EEPROM_LAYOUT
431         "\n"
432         "eeprom print [-l <layout_version>] <bus> <devaddr>\n"
433         "       - Print layout fields and their data in human readable format\n"
434         "eeprom update [-l <layout_version>] <bus> <devaddr> field_name field_value\n"
435         "       - Update a specific eeprom field with new data.\n"
436         "         The new data must be written in the same human readable format as shown by the print command.\n"
437         "\n"
438         "LAYOUT VERSIONS\n"
439         "The -l option can be used to force the command to interpret the EEPROM data using the chosen layout.\n"
440         "If the -l option is omitted, the command will auto detect the layout based on the data in the EEPROM.\n"
441         "The values which can be provided with the -l option are:\n"
442         CONFIG_EEPROM_LAYOUT_HELP_STRING"\n"
443 #endif
444 )