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1 /*
2  * (C) Copyright 2011
3  * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.com
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 #include <common.h>
25 #include <hush.h>
26 #include <i2c.h>
27 #include "common.h"
28
29 int ivm_calc_crc(unsigned char *buf, int len)
30 {
31         const unsigned short crc_tab[16] = {
32                 0x0000, 0xCC01, 0xD801, 0x1400,
33                 0xF001, 0x3C00, 0x2800, 0xE401,
34                 0xA001, 0x6C00, 0x7800, 0xB401,
35                 0x5000, 0x9C01, 0x8801, 0x4400};
36
37         unsigned short crc     = 0;   /* final result */
38         unsigned short r1      = 0;   /* temp */
39         unsigned char  byte    = 0;   /* input buffer */
40         int     i;
41
42         /* calculate CRC from array data */
43         for (i = 0; i < len; i++) {
44                 byte = buf[i];
45
46                 /* lower 4 bits */
47                 r1 = crc_tab[crc & 0xF];
48                 crc = ((crc) >> 4) & 0x0FFF;
49                 crc = crc ^ r1 ^ crc_tab[byte & 0xF];
50
51                 /* upper 4 bits */
52                 r1 = crc_tab[crc & 0xF];
53                 crc = (crc >> 4) & 0x0FFF;
54                 crc = crc ^ r1 ^ crc_tab[(byte >> 4) & 0xF];
55         }
56         return crc;
57 }
58
59 static int ivm_set_value(char *name, char *value)
60 {
61         char tempbuf[256];
62
63         if (value != NULL) {
64                 sprintf(tempbuf, "%s=%s", name, value);
65                 return set_local_var(tempbuf, 0);
66         } else {
67                 unset_local_var(name);
68         }
69         return 0;
70 }
71
72 static int ivm_get_value(unsigned char *buf, int len, char *name, int off,
73                                 int check)
74 {
75         unsigned short  val;
76         unsigned char   valbuf[30];
77
78         if ((buf[off + 0] != buf[off + 2]) &&
79             (buf[off + 2] != buf[off + 4])) {
80                 printf("%s Error corrupted %s\n", __func__, name);
81                 val = -1;
82         } else {
83                 val = buf[off + 0] + (buf[off + 1] << 8);
84                 if ((val == 0) && (check == 1))
85                         val = -1;
86         }
87         sprintf((char *)valbuf, "%x", val);
88         ivm_set_value(name, (char *)valbuf);
89         return val;
90 }
91
92 #define INV_BLOCKSIZE           0x100
93 #define INV_DATAADDRESS         0x21
94 #define INVENTORYDATASIZE       (INV_BLOCKSIZE - INV_DATAADDRESS - 3)
95
96 #define IVM_POS_SHORT_TEXT              0
97 #define IVM_POS_MANU_ID                 1
98 #define IVM_POS_MANU_SERIAL             2
99 #define IVM_POS_PART_NUMBER             3
100 #define IVM_POS_BUILD_STATE             4
101 #define IVM_POS_SUPPLIER_PART_NUMBER    5
102 #define IVM_POS_DELIVERY_DATE           6
103 #define IVM_POS_SUPPLIER_BUILD_STATE    7
104 #define IVM_POS_CUSTOMER_ID             8
105 #define IVM_POS_CUSTOMER_PROD_ID        9
106 #define IVM_POS_HISTORY                 10
107 #define IVM_POS_SYMBOL_ONLY             11
108
109 static char convert_char(char c)
110 {
111         return (c < ' ' || c > '~') ? '.' : c;
112 }
113
114 static int ivm_findinventorystring(int type,
115                                         unsigned char *const string,
116                                         unsigned long maxlen,
117                                         unsigned char *buf)
118 {
119         int xcode = 0;
120         unsigned long cr = 0;
121         unsigned long addr = INV_DATAADDRESS;
122         unsigned long size = 0;
123         unsigned long nr = type;
124         int stop = 0;   /* stop on semicolon */
125
126         memset(string, '\0', maxlen);
127         switch (type) {
128         case IVM_POS_SYMBOL_ONLY:
129                 nr = 0;
130                 stop = 1;
131         break;
132         default:
133                 nr = type;
134                 stop = 0;
135         }
136
137         /* Look for the requested number of CR. */
138         while ((cr != nr) && (addr < INVENTORYDATASIZE)) {
139                 if ((buf[addr] == '\r'))
140                         cr++;
141                 addr++;
142         }
143
144         /*
145          * the expected number of CR was found until the end of the IVM
146          *  content --> fill string
147          */
148         if (addr < INVENTORYDATASIZE) {
149                 /* Copy the IVM string in the corresponding string */
150                 for (; (buf[addr] != '\r')                      &&
151                         ((buf[addr] != ';') ||  (!stop))        &&
152                         (size < (maxlen - 1)                    &&
153                         (addr < INVENTORYDATASIZE)); addr++) {
154                         size += sprintf((char *)string + size, "%c",
155                                                 convert_char (buf[addr]));
156                 }
157
158                 /*
159                  * copy phase is done: check if everything is ok. If not,
160                  * the inventory data is most probably corrupted: tell
161                  * the world there is a problem!
162                  */
163                 if (addr == INVENTORYDATASIZE) {
164                         xcode = -1;
165                         printf("Error end of string not found\n");
166                 } else if ((size >= (maxlen - 1)) &&
167                            (buf[addr] != '\r')) {
168                         xcode = -1;
169                         printf("string too long till next CR\n");
170                 }
171         } else {
172                 /*
173                  * some CR are missing...
174                  * the inventory data is most probably corrupted
175                  */
176                 xcode = -1;
177                 printf("not enough cr found\n");
178         }
179         return xcode;
180 }
181
182 #define GET_STRING(name, which, len) \
183         if (ivm_findinventorystring(which, valbuf, len, buf) == 0) { \
184                 ivm_set_value(name, (char *)valbuf); \
185         }
186
187 static int ivm_check_crc(unsigned char *buf, int block)
188 {
189         unsigned long   crc;
190         unsigned long   crceeprom;
191
192         crc = ivm_calc_crc(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2);
193         crceeprom = (buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 1] + \
194                         buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN - 2] * 256);
195         if (crc != crceeprom) {
196                 if (block == 0)
197                         printf("Error CRC Block: %d EEprom: calculated: \
198                         %lx EEprom: %lx\n", block, crc, crceeprom);
199                 return -1;
200         }
201         return 0;
202 }
203
204 static int ivm_analyze_block2(unsigned char *buf, int len)
205 {
206         unsigned char   valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
207         unsigned long   count;
208
209         /* IVM_MAC Adress begins at offset 1 */
210         sprintf((char *)valbuf, "%pM", buf + 1);
211         ivm_set_value("IVM_MacAddress", (char *)valbuf);
212         /* if an offset is defined, add it */
213 #if defined(CONFIG_PIGGY_MAC_ADRESS_OFFSET)
214         if (CONFIG_PIGGY_MAC_ADRESS_OFFSET > 0) {
215                 unsigned long val = (buf[4] << 16) + (buf[5] << 8) + buf[6];
216
217                 val += CONFIG_PIGGY_MAC_ADRESS_OFFSET;
218                 buf[4] = (val >> 16) & 0xff;
219                 buf[5] = (val >> 8) & 0xff;
220                 buf[6] = val & 0xff;
221                 sprintf((char *)valbuf, "%pM", buf);
222         }
223 #endif
224         setenv((char *)"ethaddr", (char *)valbuf);
225
226         /* IVM_MacCount */
227         count = (buf[10] << 24) +
228                    (buf[11] << 16) +
229                    (buf[12] << 8)  +
230                     buf[13];
231         if (count == 0xffffffff)
232                 count = 1;
233         sprintf((char *)valbuf, "%lx", count);
234         ivm_set_value("IVM_MacCount", (char *)valbuf);
235         return 0;
236 }
237
238 int ivm_analyze_eeprom(unsigned char *buf, int len)
239 {
240         unsigned short  val;
241         unsigned char   valbuf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN];
242         unsigned char   *tmp;
243
244         if (ivm_check_crc(buf, 0) != 0)
245                 return -1;
246
247         ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
248                         "IVM_BoardId", 0, 1);
249         val = ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
250                         "IVM_HWKey", 6, 1);
251         if (val != 0xffff) {
252                 sprintf((char *)valbuf, "%x", ((val / 100) % 10));
253                 ivm_set_value("IVM_HWVariant", (char *)valbuf);
254                 sprintf((char *)valbuf, "%x", (val % 100));
255                 ivm_set_value("IVM_HWVersion", (char *)valbuf);
256         }
257         ivm_get_value(buf, CONFIG_SYS_IVM_EEPROM_PAGE_LEN,
258                 "IVM_Functions", 12, 0);
259
260         GET_STRING("IVM_Symbol", IVM_POS_SYMBOL_ONLY, 8)
261         GET_STRING("IVM_DeviceName", IVM_POS_SHORT_TEXT, 64)
262         tmp = (unsigned char *) getenv("IVM_DeviceName");
263         if (tmp) {
264                 int     len = strlen((char *)tmp);
265                 int     i = 0;
266
267                 while (i < len) {
268                         if (tmp[i] == ';') {
269                                 ivm_set_value("IVM_ShortText",
270                                         (char *)&tmp[i + 1]);
271                                 break;
272                         }
273                         i++;
274                 }
275                 if (i >= len)
276                         ivm_set_value("IVM_ShortText", NULL);
277         } else {
278                 ivm_set_value("IVM_ShortText", NULL);
279         }
280         GET_STRING("IVM_ManufacturerID", IVM_POS_MANU_ID, 32)
281         GET_STRING("IVM_ManufacturerSerialNumber", IVM_POS_MANU_SERIAL, 20)
282         GET_STRING("IVM_ManufacturerPartNumber", IVM_POS_PART_NUMBER, 32)
283         GET_STRING("IVM_ManufacturerBuildState", IVM_POS_BUILD_STATE, 32)
284         GET_STRING("IVM_SupplierPartNumber", IVM_POS_SUPPLIER_PART_NUMBER, 32)
285         GET_STRING("IVM_DelieveryDate", IVM_POS_DELIVERY_DATE, 32)
286         GET_STRING("IVM_SupplierBuildState", IVM_POS_SUPPLIER_BUILD_STATE, 32)
287         GET_STRING("IVM_CustomerID", IVM_POS_CUSTOMER_ID, 32)
288         GET_STRING("IVM_CustomerProductID", IVM_POS_CUSTOMER_PROD_ID, 32)
289
290         if (ivm_check_crc(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2], 2) != 0)
291                 return 0;
292         ivm_analyze_block2(&buf[CONFIG_SYS_IVM_EEPROM_PAGE_LEN * 2],
293                 CONFIG_SYS_IVM_EEPROM_PAGE_LEN);
294
295         return 0;
296 }
297
298 int ivm_read_eeprom(void)
299 {
300 #if defined(CONFIG_I2C_MUX)
301         I2C_MUX_DEVICE *dev = NULL;
302 #endif
303         uchar i2c_buffer[CONFIG_SYS_IVM_EEPROM_MAX_LEN];
304         uchar   *buf;
305         unsigned long dev_addr = CONFIG_SYS_IVM_EEPROM_ADR;
306         int ret;
307
308 #if defined(CONFIG_I2C_MUX)
309         /* First init the Bus, select the Bus */
310 #if defined(CONFIG_SYS_I2C_IVM_BUS)
311         dev = i2c_mux_ident_muxstring((uchar *)CONFIG_SYS_I2C_IVM_BUS);
312 #else
313         buf = (unsigned char *) getenv("EEprom_ivm");
314         if (buf != NULL)
315                 dev = i2c_mux_ident_muxstring(buf);
316 #endif
317         if (dev == NULL) {
318                 printf("Error couldnt add Bus for IVM\n");
319                 return -1;
320         }
321         i2c_set_bus_num(dev->busid);
322 #endif
323
324         buf = (unsigned char *) getenv("EEprom_ivm_addr");
325         if (buf != NULL) {
326                 ret = strict_strtoul((char *)buf, 16, &dev_addr);
327                 if (ret != 0)
328                         return -3;
329         }
330
331         /* add deblocking here */
332         i2c_make_abort();
333
334         ret = i2c_read(dev_addr, 0, 1, i2c_buffer,
335                 CONFIG_SYS_IVM_EEPROM_MAX_LEN);
336         if (ret != 0) {
337                 printf("Error reading EEprom\n");
338                 return -2;
339         }
340
341         return ivm_analyze_eeprom(i2c_buffer, CONFIG_SYS_IVM_EEPROM_MAX_LEN);
342 }