elf: Add support for PPC64 ELF V1 ABI in bootelf
[platform/kernel/u-boot.git] / cmd / eeprom.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2000, 2001
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  */
6
7 /*
8  * Support for read and write access to EEPROM like memory devices. This
9  * includes regular EEPROM as well as  FRAM (ferroelectic nonvolaile RAM).
10  * FRAM devices read and write data at bus speed. In particular, there is no
11  * write delay. Also, there is no limit imposed on the number of bytes that can
12  * be transferred with a single read or write.
13  *
14  * Use the following configuration options to ensure no unneeded performance
15  * degradation (typical for EEPROM) is incured for FRAM memory:
16  *
17  * #define CONFIG_SYS_I2C_FRAM
18  * #undef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
19  *
20  */
21
22 #include <common.h>
23 #include <config.h>
24 #include <command.h>
25 #include <i2c.h>
26 #include <eeprom_layout.h>
27
28 #ifndef CONFIG_SYS_I2C_SPEED
29 #define CONFIG_SYS_I2C_SPEED    50000
30 #endif
31
32 #ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
33 #define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS   0
34 #endif
35
36 #ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_BITS
37 #define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS       8
38 #endif
39
40 #ifndef I2C_RXTX_LEN
41 #define I2C_RXTX_LEN    128
42 #endif
43
44 #define EEPROM_PAGE_SIZE        (1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)
45 #define EEPROM_PAGE_OFFSET(x)   ((x) & (EEPROM_PAGE_SIZE - 1))
46
47 /*
48  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
49  *   0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
50  *
51  * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
52  *   0x00000nxx for EEPROM address selectors and page number at n.
53  */
54 #if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
55 #if !defined(CONFIG_SYS_I2C_EEPROM_ADDR_LEN) || \
56         (CONFIG_SYS_I2C_EEPROM_ADDR_LEN < 1) || \
57         (CONFIG_SYS_I2C_EEPROM_ADDR_LEN > 2)
58 #error CONFIG_SYS_I2C_EEPROM_ADDR_LEN must be 1 or 2
59 #endif
60 #endif
61
62 __weak int eeprom_write_enable(unsigned dev_addr, int state)
63 {
64         return 0;
65 }
66
67 void eeprom_init(int bus)
68 {
69         /* SPI EEPROM */
70 #if defined(CONFIG_MPC8XX_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
71         spi_init_f();
72 #endif
73
74         /* I2C EEPROM */
75 #if defined(CONFIG_SYS_I2C)
76         if (bus >= 0)
77                 i2c_set_bus_num(bus);
78         i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
79 #endif
80 }
81
82 static int eeprom_addr(unsigned dev_addr, unsigned offset, uchar *addr)
83 {
84         unsigned blk_off;
85         int alen;
86
87         blk_off = offset & 0xff;        /* block offset */
88 #if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1
89         addr[0] = offset >> 8;          /* block number */
90         addr[1] = blk_off;              /* block offset */
91         alen = 2;
92 #else
93         addr[0] = offset >> 16;         /* block number */
94         addr[1] = offset >>  8;         /* upper address octet */
95         addr[2] = blk_off;              /* lower address octet */
96         alen = 3;
97 #endif  /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN */
98
99         addr[0] |= dev_addr;            /* insert device address */
100
101         return alen;
102 }
103
104 static int eeprom_len(unsigned offset, unsigned end)
105 {
106         unsigned len = end - offset;
107
108         /*
109          * For a FRAM device there is no limit on the number of the
110          * bytes that can be ccessed with the single read or write
111          * operation.
112          */
113 #if !defined(CONFIG_SYS_I2C_FRAM)
114         unsigned blk_off = offset & 0xff;
115         unsigned maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);
116
117         if (maxlen > I2C_RXTX_LEN)
118                 maxlen = I2C_RXTX_LEN;
119
120         if (len > maxlen)
121                 len = maxlen;
122 #endif
123
124         return len;
125 }
126
127 static int eeprom_rw_block(unsigned offset, uchar *addr, unsigned alen,
128                            uchar *buffer, unsigned len, bool read)
129 {
130         int ret = 0;
131
132         /* SPI */
133 #if defined(CONFIG_MPC8XX_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
134         if (read)
135                 spi_read(addr, alen, buffer, len);
136         else
137                 spi_write(addr, alen, buffer, len);
138 #else   /* I2C */
139
140 #if defined(CONFIG_SYS_I2C_EEPROM_BUS)
141         i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS);
142 #endif
143
144         if (read)
145                 ret = i2c_read(addr[0], offset, alen - 1, buffer, len);
146         else
147                 ret = i2c_write(addr[0], offset, alen - 1, buffer, len);
148
149         if (ret)
150                 ret = 1;
151 #endif
152         return ret;
153 }
154
155 static int eeprom_rw(unsigned dev_addr, unsigned offset, uchar *buffer,
156                      unsigned cnt, bool read)
157 {
158         unsigned end = offset + cnt;
159         unsigned alen, len;
160         int rcode = 0;
161         uchar addr[3];
162
163         while (offset < end) {
164                 alen = eeprom_addr(dev_addr, offset, addr);
165
166                 len = eeprom_len(offset, end);
167
168                 rcode = eeprom_rw_block(offset, addr, alen, buffer, len, read);
169
170                 buffer += len;
171                 offset += len;
172
173                 if (!read)
174                         udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
175         }
176
177         return rcode;
178 }
179
180 int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
181 {
182         /*
183          * Read data until done or would cross a page boundary.
184          * We must write the address again when changing pages
185          * because the next page may be in a different device.
186          */
187         return eeprom_rw(dev_addr, offset, buffer, cnt, 1);
188 }
189
190 int eeprom_write(unsigned dev_addr, unsigned offset,
191                  uchar *buffer, unsigned cnt)
192 {
193         int ret;
194
195         eeprom_write_enable(dev_addr, 1);
196
197         /*
198          * Write data until done or would cross a write page boundary.
199          * We must write the address again when changing pages
200          * because the address counter only increments within a page.
201          */
202         ret = eeprom_rw(dev_addr, offset, buffer, cnt, 0);
203
204         eeprom_write_enable(dev_addr, 0);
205         return ret;
206 }
207
208 static int parse_numeric_param(char *str)
209 {
210         char *endptr;
211         int value = simple_strtol(str, &endptr, 16);
212
213         return (*endptr != '\0') ? -1 : value;
214 }
215
216 /**
217  * parse_i2c_bus_addr - parse the i2c bus and i2c devaddr parameters
218  *
219  * @i2c_bus:    address to store the i2c bus
220  * @i2c_addr:   address to store the device i2c address
221  * @argc:       count of command line arguments left to parse
222  * @argv:       command line arguments left to parse
223  * @argc_no_bus_addr:   argc value we expect to see when bus & addr aren't given
224  *
225  * @returns:    number of arguments parsed or CMD_RET_USAGE if error
226  */
227 static int parse_i2c_bus_addr(int *i2c_bus, ulong *i2c_addr, int argc,
228                               char * const argv[], int argc_no_bus_addr)
229 {
230         int argc_no_bus = argc_no_bus_addr + 1;
231         int argc_bus_addr = argc_no_bus_addr + 2;
232
233 #ifdef CONFIG_SYS_DEF_EEPROM_ADDR
234         if (argc == argc_no_bus_addr) {
235                 *i2c_bus = -1;
236                 *i2c_addr = CONFIG_SYS_DEF_EEPROM_ADDR;
237
238                 return 0;
239         }
240 #endif
241         if (argc == argc_no_bus) {
242                 *i2c_bus = -1;
243                 *i2c_addr = parse_numeric_param(argv[0]);
244
245                 return 1;
246         }
247
248         if (argc == argc_bus_addr) {
249                 *i2c_bus = parse_numeric_param(argv[0]);
250                 *i2c_addr = parse_numeric_param(argv[1]);
251
252                 return 2;
253         }
254
255         return CMD_RET_USAGE;
256 }
257
258 #ifdef CONFIG_CMD_EEPROM_LAYOUT
259
260 __weak int eeprom_parse_layout_version(char *str)
261 {
262         return LAYOUT_VERSION_UNRECOGNIZED;
263 }
264
265 static unsigned char eeprom_buf[CONFIG_SYS_EEPROM_SIZE];
266
267 #endif
268
269 enum eeprom_action {
270         EEPROM_READ,
271         EEPROM_WRITE,
272         EEPROM_PRINT,
273         EEPROM_UPDATE,
274         EEPROM_ACTION_INVALID,
275 };
276
277 static enum eeprom_action parse_action(char *cmd)
278 {
279         if (!strncmp(cmd, "read", 4))
280                 return EEPROM_READ;
281         if (!strncmp(cmd, "write", 5))
282                 return EEPROM_WRITE;
283 #ifdef CONFIG_CMD_EEPROM_LAYOUT
284         if (!strncmp(cmd, "print", 5))
285                 return EEPROM_PRINT;
286         if (!strncmp(cmd, "update", 6))
287                 return EEPROM_UPDATE;
288 #endif
289
290         return EEPROM_ACTION_INVALID;
291 }
292
293 static int eeprom_execute_command(enum eeprom_action action, int i2c_bus,
294                                   ulong i2c_addr, int layout_ver, char *key,
295                                   char *value, ulong addr, ulong off, ulong cnt)
296 {
297         int rcode = 0;
298         const char *const fmt =
299                 "\nEEPROM @0x%lX %s: addr %08lx  off %04lx  count %ld ... ";
300 #ifdef CONFIG_CMD_EEPROM_LAYOUT
301         struct eeprom_layout layout;
302 #endif
303
304         if (action == EEPROM_ACTION_INVALID)
305                 return CMD_RET_USAGE;
306
307         eeprom_init(i2c_bus);
308         if (action == EEPROM_READ) {
309                 printf(fmt, i2c_addr, "read", addr, off, cnt);
310
311                 rcode = eeprom_read(i2c_addr, off, (uchar *)addr, cnt);
312
313                 puts("done\n");
314                 return rcode;
315         } else if (action == EEPROM_WRITE) {
316                 printf(fmt, i2c_addr, "write", addr, off, cnt);
317
318                 rcode = eeprom_write(i2c_addr, off, (uchar *)addr, cnt);
319
320                 puts("done\n");
321                 return rcode;
322         }
323
324 #ifdef CONFIG_CMD_EEPROM_LAYOUT
325         rcode = eeprom_read(i2c_addr, 0, eeprom_buf, CONFIG_SYS_EEPROM_SIZE);
326         if (rcode < 0)
327                 return rcode;
328
329         eeprom_layout_setup(&layout, eeprom_buf, CONFIG_SYS_EEPROM_SIZE,
330                             layout_ver);
331
332         if (action == EEPROM_PRINT) {
333                 layout.print(&layout);
334                 return 0;
335         }
336
337         layout.update(&layout, key, value);
338
339         rcode = eeprom_write(i2c_addr, 0, layout.data, CONFIG_SYS_EEPROM_SIZE);
340 #endif
341
342         return rcode;
343 }
344
345 #define NEXT_PARAM(argc, index) { (argc)--; (index)++; }
346 int do_eeprom(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
347 {
348         int layout_ver = LAYOUT_VERSION_AUTODETECT;
349         enum eeprom_action action = EEPROM_ACTION_INVALID;
350         int i2c_bus = -1, index = 0;
351         ulong i2c_addr = -1, addr = 0, cnt = 0, off = 0;
352         int ret;
353         char *field_name = "";
354         char *field_value = "";
355
356         if (argc <= 1)
357                 return CMD_RET_USAGE;
358
359         NEXT_PARAM(argc, index); /* Skip program name */
360
361         action = parse_action(argv[index]);
362         NEXT_PARAM(argc, index);
363
364         if (action == EEPROM_ACTION_INVALID)
365                 return CMD_RET_USAGE;
366
367 #ifdef CONFIG_CMD_EEPROM_LAYOUT
368         if (action == EEPROM_PRINT || action == EEPROM_UPDATE) {
369                 if (!strcmp(argv[index], "-l")) {
370                         NEXT_PARAM(argc, index);
371                         layout_ver = eeprom_parse_layout_version(argv[index]);
372                         NEXT_PARAM(argc, index);
373                 }
374         }
375 #endif
376
377         switch (action) {
378         case EEPROM_READ:
379         case EEPROM_WRITE:
380                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
381                                          argv + index, 3);
382                 break;
383         case EEPROM_PRINT:
384                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
385                                          argv + index, 0);
386                 break;
387         case EEPROM_UPDATE:
388                 ret = parse_i2c_bus_addr(&i2c_bus, &i2c_addr, argc,
389                                          argv + index, 2);
390                 break;
391         default:
392                 /* Get compiler to stop whining */
393                 return CMD_RET_USAGE;
394         }
395
396         if (ret == CMD_RET_USAGE)
397                 return ret;
398
399         while (ret--)
400                 NEXT_PARAM(argc, index);
401
402         if (action == EEPROM_READ || action == EEPROM_WRITE) {
403                 addr = parse_numeric_param(argv[index]);
404                 NEXT_PARAM(argc, index);
405                 off = parse_numeric_param(argv[index]);
406                 NEXT_PARAM(argc, index);
407                 cnt = parse_numeric_param(argv[index]);
408         }
409
410 #ifdef CONFIG_CMD_EEPROM_LAYOUT
411         if (action == EEPROM_UPDATE) {
412                 field_name = argv[index];
413                 NEXT_PARAM(argc, index);
414                 field_value = argv[index];
415                 NEXT_PARAM(argc, index);
416         }
417 #endif
418
419         return eeprom_execute_command(action, i2c_bus, i2c_addr, layout_ver,
420                                       field_name, field_value, addr, off, cnt);
421 }
422
423 U_BOOT_CMD(
424         eeprom, 8,      1,      do_eeprom,
425         "EEPROM sub-system",
426         "read  <bus> <devaddr> addr off cnt\n"
427         "eeprom write <bus> <devaddr> addr off cnt\n"
428         "       - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'"
429 #ifdef CONFIG_CMD_EEPROM_LAYOUT
430         "\n"
431         "eeprom print [-l <layout_version>] <bus> <devaddr>\n"
432         "       - Print layout fields and their data in human readable format\n"
433         "eeprom update [-l <layout_version>] <bus> <devaddr> field_name field_value\n"
434         "       - Update a specific eeprom field with new data.\n"
435         "         The new data must be written in the same human readable format as shown by the print command.\n"
436         "\n"
437         "LAYOUT VERSIONS\n"
438         "The -l option can be used to force the command to interpret the EEPROM data using the chosen layout.\n"
439         "If the -l option is omitted, the command will auto detect the layout based on the data in the EEPROM.\n"
440         "The values which can be provided with the -l option are:\n"
441         CONFIG_EEPROM_LAYOUT_HELP_STRING"\n"
442 #endif
443 )