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Merge branch 'master' of git://git.denx.de/u-boot-i2c
[u-boot] / board / funkwerk / vovpn-gw / flash.c
1 /*
2  * (C) Copyright 2004
3  * Elmeg Communications Systems GmbH, Juergen Selent (j.selent@elmeg.de)
4  *
5  * Support for the Elmeg VoVPN Gateway Module
6  * ------------------------------------------
7  * This is a signle bank flashdriver for INTEL 28F320J3, 28F640J3
8  * and 28F128J3A flashs working in 8 Bit mode.
9  *
10  * Most of this code is taken from existing u-boot source code.
11  *
12  * SPDX-License-Identifier:     GPL-2.0+
13  */
14
15 #include <common.h>
16
17 flash_info_t                            flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
18
19 #define FLASH_CMD_READ_ID               0x90
20 #define FLASH_CMD_READ_STATUS           0x70
21 #define FLASH_CMD_RESET                 0xff
22 #define FLASH_CMD_BLOCK_ERASE           0x20
23 #define FLASH_CMD_ERASE_CONFIRM         0xd0
24 #define FLASH_CMD_CLEAR_STATUS          0x50
25 #define FLASH_CMD_SUSPEND_ERASE         0xb0
26 #define FLASH_CMD_WRITE                 0x40
27 #define FLASH_CMD_WRITE_BUFF            0xe8
28 #define FLASH_CMD_PROG_RESUME           0xd0
29 #define FLASH_CMD_PROTECT               0x60
30 #define FLASH_CMD_PROTECT_SET           0x01
31 #define FLASH_CMD_PROTECT_CLEAR         0xd0
32 #define FLASH_STATUS_DONE               0x80
33
34 #define FLASH_WRITE_BUFFER_SIZE         32
35
36 #ifdef CONFIG_SYS_FLASH_16BIT
37 #define FLASH_WORD_SIZE                 unsigned short
38 #define FLASH_ID_MASK                   0xffff
39 #define FLASH_CMD_ADDR_SHIFT            0
40 #else
41 #define FLASH_WORD_SIZE                 unsigned char
42 #define FLASH_ID_MASK                   0xff
43 /* A0 is not used in either 8x or 16x for READ ID */
44 #define FLASH_CMD_ADDR_SHIFT            1
45 #endif
46
47
48 static unsigned long
49 flash_get(volatile FLASH_WORD_SIZE *addr, flash_info_t *info)
50 {
51         volatile FLASH_WORD_SIZE *p;
52         FLASH_WORD_SIZE value;
53         int i;
54
55         addr[0] = FLASH_CMD_READ_ID;
56
57         /* manufactor */
58         value = addr[0 << FLASH_CMD_ADDR_SHIFT];
59         switch (value) {
60         case (INTEL_MANUFACT & FLASH_ID_MASK):
61                 info->flash_id = FLASH_MAN_INTEL;
62                 break;
63         default:
64                 info->flash_id = FLASH_UNKNOWN;
65                 info->sector_count = 0;
66                 info->size = 0;
67                 *addr = FLASH_CMD_RESET;
68                 return (0);
69
70         }
71
72         /* device */
73         value = addr[1 << FLASH_CMD_ADDR_SHIFT];
74         switch (value) {
75         case (INTEL_ID_28F320J3A & FLASH_ID_MASK):
76                 info->flash_id += FLASH_28F320J3A;
77                 info->sector_count = 32;
78                 info->size = 0x00400000;
79                 break;
80         case (INTEL_ID_28F640J3A & FLASH_ID_MASK):
81                 info->flash_id += FLASH_28F640J3A;
82                 info->sector_count = 64;
83                 info->size = 0x00800000;
84                 break;
85         case (INTEL_ID_28F128J3A & FLASH_ID_MASK):
86                 info->flash_id += FLASH_28F128J3A;
87                 info->sector_count = 128;
88                 info->size = 0x01000000;
89                 break;
90         default:
91                 info->flash_id = FLASH_UNKNOWN;
92                 info->sector_count = 0;
93                 info->size = 0;
94                 *addr = FLASH_CMD_RESET;
95                 return (0);
96         }
97
98         /* setup sectors */
99         for (i = 0; i < info->sector_count; i++) {
100                 info->start[i] = (unsigned long)addr + (i * info->size/info->sector_count);
101         }
102
103         /* check protected sectors */
104         for (i = 0; i < info->sector_count; i++) {
105                 p = (volatile FLASH_WORD_SIZE *)(info->start[i]);
106                 info->protect[i] = p[2 << FLASH_CMD_ADDR_SHIFT] & 1;
107         }
108
109         /* reset bank */
110         *addr = FLASH_CMD_RESET;
111         return (info->size);
112 }
113
114 unsigned long
115 flash_init(void)
116 {
117         unsigned long   size;
118         int             i;
119
120         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
121                 flash_info[i].flash_id = FLASH_UNKNOWN;
122         }
123         size = flash_get((volatile FLASH_WORD_SIZE *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
124         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
125                 printf ("## Unknown FLASH Size=0x%08lx\n", size);
126                 return (0);
127         }
128
129         /* always protect 1 sector containing the HRCW */
130         flash_protect(FLAG_PROTECT_SET,
131                       flash_info[0].start[0],
132                       flash_info[0].start[1] - 1,
133                       &flash_info[0]);
134
135 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
136         flash_protect(FLAG_PROTECT_SET,
137                       CONFIG_SYS_MONITOR_FLASH,
138                       CONFIG_SYS_MONITOR_FLASH+CONFIG_SYS_MONITOR_LEN-1,
139                       &flash_info[0]);
140 #endif
141 #ifdef  CONFIG_ENV_IS_IN_FLASH
142         flash_protect(FLAG_PROTECT_SET,
143                       CONFIG_ENV_ADDR,
144                       CONFIG_ENV_ADDR+CONFIG_ENV_SECT_SIZE-1,
145                       &flash_info[0]);
146 #endif
147         return (size);
148 }
149
150 void
151 flash_print_info(flash_info_t *info)
152 {
153         int i;
154
155         if (info->flash_id == FLASH_UNKNOWN) {
156                 printf ("missing or unknown FLASH type\n");
157                 return;
158         }
159
160         switch (info->flash_id & FLASH_VENDMASK) {
161         case FLASH_MAN_INTEL:   printf ("INTEL ");              break;
162         default:                printf ("Unknown Vendor ");     break;
163         }
164
165         switch (info->flash_id & FLASH_TYPEMASK) {
166         case FLASH_28F320J3A:   printf ("28F320JA3 (32 Mbit)\n");
167                                 break;
168         case FLASH_28F640J3A:   printf ("28F640JA3 (64 Mbit)\n");
169                                 break;
170         case FLASH_28F128J3A:   printf ("28F128JA3 (128 Mbit)\n");
171                                 break;
172         default:                printf ("Unknown Chip Type");
173                                 break;
174         }
175
176         printf ("  Size: %ld MB in %d Sectors\n",
177                 info->size >> 20, info->sector_count);
178
179         printf ("  Sector Start Addresses:");
180         for (i=0; i<info->sector_count; ++i) {
181                 if ((i % 5) == 0)
182                         printf ("\n   ");
183                 printf (" %08lX%s",
184                         info->start[i],
185                         info->protect[i] ? " (RO)" : "     "
186                 );
187         }
188         printf ("\n");
189 }
190
191 int
192 flash_erase(flash_info_t *info, int s_first, int s_last)
193 {
194         unsigned long start, now, last;
195         int flag, prot, sect;
196         volatile FLASH_WORD_SIZE *addr;
197         FLASH_WORD_SIZE status;
198
199         if ((s_first < 0) || (s_first > s_last)) {
200                 if (info->flash_id == FLASH_UNKNOWN) {
201                         printf ("- missing\n");
202                 } else {
203                         printf ("- no sectors to erase\n");
204                 }
205                 return (1);
206         }
207
208         if (info->flash_id == FLASH_UNKNOWN) {
209                 printf ("Cannot erase unknown flash - aborted\n");
210                 return (1);
211         }
212
213         prot = 0;
214         for (sect=s_first; sect<=s_last; ++sect) {
215                 if (info->protect[sect]) {
216                         prot++;
217                 }
218         }
219
220         if (prot) {
221                 printf ("- Warning: %d protected sectors will not be erased!\n", prot);
222         } else {
223                 printf ("\n");
224         }
225
226         start = get_timer (0);
227         last  = start;
228
229         for (sect = s_first; sect<=s_last; sect++) {
230                 if (info->protect[sect]) {
231                         continue;
232                 }
233
234                 addr = (volatile FLASH_WORD_SIZE *)(info->start[sect]);
235                 /* Disable interrupts which might cause a timeout here */
236                 flag = disable_interrupts();
237
238 #ifdef DEBUG
239                 printf("Erase sector %d at start addr 0x%08X", sect, (unsigned int)info->start[sect]);
240 #endif
241
242                 *addr = FLASH_CMD_CLEAR_STATUS;
243                 *addr = FLASH_CMD_BLOCK_ERASE;
244                 *addr = FLASH_CMD_ERASE_CONFIRM;
245
246                 /* re-enable interrupts if necessary */
247                 if (flag) {
248                         enable_interrupts();
249                 }
250
251                 /* wait at least 80us - let's wait 1 ms */
252                 udelay (1000);
253
254                 while (((status = *addr) & FLASH_STATUS_DONE) != FLASH_STATUS_DONE) {
255                         if ((now=get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
256                                 printf("Flash erase timeout at address %lx\n", info->start[sect]);
257                                 *addr = FLASH_CMD_SUSPEND_ERASE;
258                                 *addr = FLASH_CMD_RESET;
259                                 return (1);
260                         }
261
262                         /* show that we're waiting */
263                         if ((now - last) > 1000) {      /* every second */
264                                 putc ('.');
265                                 last = now;
266                         }
267                 }
268                 *addr = FLASH_CMD_RESET;
269         }
270         printf (" done\n");
271         return (0);
272 }
273
274 static int
275 write_buff2( volatile FLASH_WORD_SIZE *dst,
276              volatile FLASH_WORD_SIZE *src,
277              unsigned long cnt )
278 {
279         unsigned long start;
280         FLASH_WORD_SIZE status;
281         int flag, i;
282
283         start = get_timer (0);
284         while (1) {
285                 /* Disable interrupts which might cause a timeout here */
286                 flag = disable_interrupts();
287                 dst[0] = FLASH_CMD_WRITE_BUFF;
288                 if ((status = *dst) & FLASH_STATUS_DONE) {
289                         break;
290                 }
291
292                 /* re-enable interrupts if necessary */
293                 if (flag) {
294                         enable_interrupts();
295                 }
296
297                 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
298                         return (-1);
299                 }
300         }
301         dst[0] = (FLASH_WORD_SIZE)(cnt - 1);
302         for (i=0; i<cnt; i++) {
303                 dst[i] = src[i];
304         }
305         dst[0] = FLASH_CMD_PROG_RESUME;
306
307         if (flag) {
308                 enable_interrupts();
309         }
310
311         return( 0 );
312 }
313
314 static int
315 poll_status( volatile FLASH_WORD_SIZE *addr )
316 {
317         unsigned long start;
318
319         start = get_timer (0);
320         /* wait for error or finish */
321         while (1) {
322                 if (*addr == FLASH_STATUS_DONE) {
323                         if (*addr == FLASH_STATUS_DONE) {
324                                 break;
325                         }
326                 }
327                 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
328                         *addr = FLASH_CMD_RESET;
329                         return (-1);
330                 }
331         }
332         *addr = FLASH_CMD_RESET;
333         return (0);
334 }
335
336 /*
337  * write_buff return values:
338  * 0 - OK
339  * 1 - write timeout
340  * 2 - Flash not erased
341  * 4 - Flash not identified
342  */
343 int
344 write_buff(flash_info_t *info, uchar *src, ulong udst, ulong cnt)
345 {
346         volatile FLASH_WORD_SIZE *addr, *dst;
347         unsigned long bcnt;
348         int flag, i;
349
350         if (info->flash_id == FLASH_UNKNOWN) {
351                 return (4);
352         }
353
354         addr = (volatile FLASH_WORD_SIZE *)(info->start[0]);
355         dst = (volatile FLASH_WORD_SIZE *) udst;
356
357 #ifdef CONFIG_SYS_FLASH_16BIT
358 #error NYI
359 #else
360         while (cnt > 0) {
361                 /* Check if buffer write is possible */
362                 if (cnt > 1 && (((unsigned long)dst & (FLASH_WRITE_BUFFER_SIZE - 1)) == 0)) {
363                         bcnt = cnt > FLASH_WRITE_BUFFER_SIZE ? FLASH_WRITE_BUFFER_SIZE : cnt;
364                         /* Check if Flash is (sufficiently) erased */
365                         for (i=0; i<bcnt; i++) {
366                                 if ((dst[i] & src[i]) != src[i]) {
367                                         return (2);
368                                 }
369                         }
370                         if (write_buff2( dst,src,bcnt ) != 0) {
371                                 addr[0] = FLASH_CMD_READ_STATUS;
372                         }
373                         if (poll_status( dst ) != 0) {
374                                 return (1);
375                         }
376                         cnt -= bcnt;
377                         dst += bcnt;
378                         src += bcnt;
379                         continue;
380                 }
381
382                 /* Check if Flash is (sufficiently) erased */
383                 if ((*dst & *src) != *src) {
384                         return (2);
385                 }
386
387                 /* Disable interrupts which might cause a timeout here */
388                 flag = disable_interrupts();
389                 addr[0] = FLASH_CMD_ERASE_CONFIRM;
390                 addr[0] = FLASH_CMD_WRITE;
391                 *dst++ = *src++;
392                 /* re-enable interrupts if necessary */
393                 if (flag) {
394                         enable_interrupts();
395                 }
396
397                 if (poll_status( dst ) != 0) {
398                         return (1);
399                 }
400                 cnt --;
401         }
402 #endif
403         return (0);
404 }
405
406 int
407 flash_real_protect(flash_info_t *info, long sector, int prot)
408 {
409         volatile FLASH_WORD_SIZE *addr;
410         unsigned long start;
411
412         addr = (volatile FLASH_WORD_SIZE *)(info->start[sector]);
413         *addr = FLASH_CMD_CLEAR_STATUS;
414         *addr = FLASH_CMD_PROTECT;
415
416         if(prot) {
417                 *addr = FLASH_CMD_PROTECT_SET;
418         } else {
419                 *addr = FLASH_CMD_PROTECT_CLEAR;
420         }
421
422         /* wait for error or finish */
423         start = get_timer (0);
424         while(!(addr[0] & FLASH_STATUS_DONE)){
425                 if (get_timer(start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
426                         printf("Flash protect timeout at address %lx\n",  info->start[sector]);
427                         addr[0] = FLASH_CMD_RESET;
428                         return (1);
429                 }
430         }
431
432         /* Set software protect flag */
433         info->protect[sector] = prot;
434         *addr = FLASH_CMD_RESET;
435         return (0);
436 }