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62219a28 WD |
1 | /* |
2 | * (C) Copyright 2000 | |
3 | * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it | |
4 | * | |
5 | * (C) Copyright 2000 Sysgo Real-Time Solutions, GmbH <www.elinos.com> | |
6 | * Marius Groeger <mgroeger@sysgo.de> | |
7 | * | |
8 | * See file CREDITS for list of people who contributed to this | |
9 | * project. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation; either version 2 of | |
14 | * the License, or (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
24 | * MA 02111-1307 USA | |
25 | * | |
26 | * Back ported to the 8xx platform (from the 8260 platform) by | |
27 | * Murray.Jensen@cmst.csiro.au, 27-Jan-01. | |
28 | */ | |
29 | ||
30 | #include <common.h> | |
31 | ||
32 | #ifdef CONFIG_HARD_I2C | |
33 | ||
34 | #include <commproc.h> | |
35 | #include <i2c.h> | |
36 | #ifdef CONFIG_LWMON | |
37 | #include <watchdog.h> | |
38 | #endif | |
39 | ||
d87080b7 WD |
40 | DECLARE_GLOBAL_DATA_PTR; |
41 | ||
62219a28 WD |
42 | /* define to enable debug messages */ |
43 | #undef DEBUG_I2C | |
44 | ||
62219a28 WD |
45 | /* tx/rx timeout (we need the i2c early, so we don't use get_timer()) */ |
46 | #define TOUT_LOOP 1000000 | |
47 | ||
48 | #define NUM_RX_BDS 4 | |
49 | #define NUM_TX_BDS 4 | |
50 | #define MAX_TX_SPACE 256 | |
51 | #define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */ | |
52 | ||
53 | typedef struct I2C_BD | |
54 | { | |
55 | unsigned short status; | |
56 | unsigned short length; | |
57 | unsigned char *addr; | |
58 | } I2C_BD; | |
59 | #define BD_I2C_TX_START 0x0400 /* special status for i2c: Start condition */ | |
60 | ||
61 | #define BD_I2C_TX_CL 0x0001 /* collision error */ | |
62 | #define BD_I2C_TX_UN 0x0002 /* underflow error */ | |
63 | #define BD_I2C_TX_NAK 0x0004 /* no acknowledge error */ | |
64 | #define BD_I2C_TX_ERR (BD_I2C_TX_NAK|BD_I2C_TX_UN|BD_I2C_TX_CL) | |
65 | ||
66 | #define BD_I2C_RX_ERR BD_SC_OV | |
67 | ||
68 | typedef void (*i2c_ecb_t)(int, int); /* error callback function */ | |
69 | ||
70 | /* This structure keeps track of the bd and buffer space usage. */ | |
71 | typedef struct i2c_state { | |
72 | int rx_idx; /* index to next free Rx BD */ | |
73 | int tx_idx; /* index to next free Tx BD */ | |
74 | void *rxbd; /* pointer to next free Rx BD */ | |
75 | void *txbd; /* pointer to next free Tx BD */ | |
76 | int tx_space; /* number of Tx bytes left */ | |
77 | unsigned char *tx_buf; /* pointer to free Tx area */ | |
78 | i2c_ecb_t err_cb; /* error callback function */ | |
79 | } i2c_state_t; | |
80 | ||
81 | ||
82 | /* flags for i2c_send() and i2c_receive() */ | |
83 | #define I2CF_ENABLE_SECONDARY 0x01 /* secondary_address is valid */ | |
84 | #define I2CF_START_COND 0x02 /* tx: generate start condition */ | |
85 | #define I2CF_STOP_COND 0x04 /* tx: generate stop condition */ | |
86 | ||
87 | /* return codes */ | |
88 | #define I2CERR_NO_BUFFERS 0x01 /* no more BDs or buffer space */ | |
89 | #define I2CERR_MSG_TOO_LONG 0x02 /* tried to send/receive to much data */ | |
90 | #define I2CERR_TIMEOUT 0x03 /* timeout in i2c_doio() */ | |
91 | #define I2CERR_QUEUE_EMPTY 0x04 /* i2c_doio called without send/receive */ | |
92 | ||
93 | /* error callback flags */ | |
94 | #define I2CECB_RX_ERR 0x10 /* this is a receive error */ | |
95 | #define I2CECB_RX_ERR_OV 0x02 /* receive overrun error */ | |
96 | #define I2CECB_RX_MASK 0x0f /* mask for error bits */ | |
97 | #define I2CECB_TX_ERR 0x20 /* this is a transmit error */ | |
98 | #define I2CECB_TX_CL 0x01 /* transmit collision error */ | |
99 | #define I2CECB_TX_UN 0x02 /* transmit underflow error */ | |
100 | #define I2CECB_TX_NAK 0x04 /* transmit no ack error */ | |
101 | #define I2CECB_TX_MASK 0x0f /* mask for error bits */ | |
102 | #define I2CECB_TIMEOUT 0x40 /* this is a timeout error */ | |
103 | ||
104 | #ifdef DEBUG_I2C | |
105 | #define PRINTD(x) printf x | |
106 | #else | |
107 | #define PRINTD(x) | |
108 | #endif | |
109 | ||
110 | /* | |
111 | * Returns the best value of I2BRG to meet desired clock speed of I2C with | |
112 | * input parameters (clock speed, filter, and predivider value). | |
113 | * It returns computer speed value and the difference between it and desired | |
114 | * speed. | |
115 | */ | |
116 | static inline int | |
117 | i2c_roundrate(int hz, int speed, int filter, int modval, | |
118 | int *brgval, int *totspeed) | |
119 | { | |
120 | int moddiv = 1 << (5-(modval & 3)), brgdiv, div; | |
121 | ||
122 | PRINTD(("\t[I2C] trying hz=%d, speed=%d, filter=%d, modval=%d\n", | |
123 | hz, speed, filter, modval)); | |
124 | ||
125 | div = moddiv * speed; | |
126 | brgdiv = (hz + div - 1) / div; | |
127 | ||
128 | PRINTD(("\t\tmoddiv=%d, brgdiv=%d\n", moddiv, brgdiv)); | |
129 | ||
130 | *brgval = ((brgdiv + 1) / 2) - 3 - (2*filter); | |
131 | ||
132 | if ((*brgval < 0) || (*brgval > 255)) { | |
133 | PRINTD(("\t\trejected brgval=%d\n", *brgval)); | |
134 | return -1; | |
135 | } | |
136 | ||
137 | brgdiv = 2 * (*brgval + 3 + (2 * filter)); | |
138 | div = moddiv * brgdiv ; | |
139 | *totspeed = hz / div; | |
140 | ||
141 | PRINTD(("\t\taccepted brgval=%d, totspeed=%d\n", *brgval, *totspeed)); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Sets the I2C clock predivider and divider to meet required clock speed. | |
148 | */ | |
149 | static int | |
150 | i2c_setrate (int hz, int speed) | |
151 | { | |
6d0f6bcf | 152 | immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; |
62219a28 WD |
153 | volatile i2c8xx_t *i2c = (i2c8xx_t *) & immap->im_i2c; |
154 | int brgval, | |
155 | modval, /* 0-3 */ | |
156 | bestspeed_diff = speed, | |
157 | bestspeed_brgval = 0, | |
158 | bestspeed_modval = 0, | |
159 | bestspeed_filter = 0, | |
160 | totspeed, | |
161 | filter = 0; /* Use this fixed value */ | |
162 | ||
163 | for (modval = 0; modval < 4; modval++) { | |
164 | if (i2c_roundrate(hz,speed,filter,modval,&brgval,&totspeed) == 0) { | |
165 | int diff = speed - totspeed; | |
166 | ||
167 | if ((diff >= 0) && (diff < bestspeed_diff)) { | |
168 | bestspeed_diff = diff; | |
169 | bestspeed_modval = modval; | |
170 | bestspeed_brgval = brgval; | |
171 | bestspeed_filter = filter; | |
172 | } | |
173 | } | |
174 | } | |
175 | ||
176 | PRINTD (("[I2C] Best is:\n")); | |
177 | PRINTD (("[I2C] CPU=%dhz RATE=%d F=%d I2MOD=%08x I2BRG=%08x DIFF=%dhz\n", | |
178 | hz, | |
179 | speed, | |
180 | bestspeed_filter, | |
181 | bestspeed_modval, | |
182 | bestspeed_brgval, | |
183 | bestspeed_diff)); | |
184 | ||
185 | i2c->i2c_i2mod |= ((bestspeed_modval & 3) << 1) | (bestspeed_filter << 3); | |
186 | i2c->i2c_i2brg = bestspeed_brgval & 0xff; | |
187 | ||
188 | PRINTD (("[I2C] i2mod=%08x i2brg=%08x\n", i2c->i2c_i2mod, | |
189 | i2c->i2c_i2brg)); | |
190 | ||
191 | return 1; | |
192 | } | |
193 | ||
194 | void | |
195 | i2c_init(int speed, int slaveaddr) | |
196 | { | |
6d0f6bcf | 197 | volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR ; |
62219a28 WD |
198 | volatile cpm8xx_t *cp = (cpm8xx_t *)&immap->im_cpm; |
199 | volatile i2c8xx_t *i2c = (i2c8xx_t *)&immap->im_i2c; | |
200 | volatile iic_t *iip = (iic_t *)&cp->cp_dparam[PROFF_IIC]; | |
201 | ulong rbase, tbase; | |
202 | volatile I2C_BD *rxbd, *txbd; | |
203 | uint dpaddr; | |
204 | ||
6d0f6bcf | 205 | #ifdef CONFIG_SYS_I2C_INIT_BOARD |
47cd00fa WD |
206 | /* call board specific i2c bus reset routine before accessing the */ |
207 | /* environment, which might be in a chip on that bus. For details */ | |
208 | /* about this problem see doc/I2C_Edge_Conditions. */ | |
209 | i2c_init_board(); | |
210 | #endif | |
211 | ||
6d0f6bcf | 212 | #ifdef CONFIG_SYS_I2C_UCODE_PATCH |
62219a28 WD |
213 | iip = (iic_t *)&cp->cp_dpmem[iip->iic_rpbase]; |
214 | #else | |
215 | /* Disable relocation */ | |
216 | iip->iic_rpbase = 0; | |
217 | #endif | |
218 | ||
6d0f6bcf | 219 | #ifdef CONFIG_SYS_ALLOC_DPRAM |
62219a28 WD |
220 | dpaddr = iip->iic_rbase; |
221 | if (dpaddr == 0) { | |
222 | /* need to allocate dual port ram */ | |
223 | dpaddr = dpram_alloc_align( | |
224 | (NUM_RX_BDS * sizeof(I2C_BD)) + (NUM_TX_BDS * sizeof(I2C_BD)) + | |
225 | MAX_TX_SPACE, 8); | |
226 | } | |
227 | #else | |
228 | dpaddr = CPM_I2C_BASE; | |
229 | #endif | |
230 | ||
231 | /* | |
232 | * initialise data in dual port ram: | |
233 | * | |
234 | * dpaddr->rbase -> rx BD (NUM_RX_BDS * sizeof(I2C_BD) bytes) | |
235 | * tbase -> tx BD (NUM_TX_BDS * sizeof(I2C_BD) bytes) | |
236 | * tx buffer (MAX_TX_SPACE bytes) | |
237 | */ | |
238 | ||
239 | rbase = dpaddr; | |
240 | tbase = rbase + NUM_RX_BDS * sizeof(I2C_BD); | |
241 | ||
242 | /* Initialize Port B I2C pins. */ | |
243 | cp->cp_pbpar |= 0x00000030; | |
244 | cp->cp_pbdir |= 0x00000030; | |
245 | cp->cp_pbodr |= 0x00000030; | |
246 | ||
247 | /* Disable interrupts */ | |
248 | i2c->i2c_i2mod = 0x00; | |
249 | i2c->i2c_i2cmr = 0x00; | |
250 | i2c->i2c_i2cer = 0xff; | |
251 | i2c->i2c_i2add = slaveaddr; | |
252 | ||
253 | /* | |
254 | * Set the I2C BRG Clock division factor from desired i2c rate | |
255 | * and current CPU rate (we assume sccr dfbgr field is 0; | |
256 | * divide BRGCLK by 1) | |
257 | */ | |
258 | PRINTD(("[I2C] Setting rate...\n")); | |
6d0f6bcf | 259 | i2c_setrate (gd->cpu_clk, CONFIG_SYS_I2C_SPEED) ; |
62219a28 WD |
260 | |
261 | /* Set I2C controller in master mode */ | |
262 | i2c->i2c_i2com = 0x01; | |
263 | ||
264 | /* Set SDMA bus arbitration level to 5 (SDCR) */ | |
265 | immap->im_siu_conf.sc_sdcr = 0x0001 ; | |
266 | ||
267 | /* Initialize Tx/Rx parameters */ | |
268 | iip->iic_rbase = rbase; | |
269 | iip->iic_tbase = tbase; | |
270 | rxbd = (I2C_BD *)((unsigned char *)&cp->cp_dpmem[iip->iic_rbase]); | |
271 | txbd = (I2C_BD *)((unsigned char *)&cp->cp_dpmem[iip->iic_tbase]); | |
272 | ||
273 | PRINTD(("[I2C] rbase = %04x\n", iip->iic_rbase)); | |
274 | PRINTD(("[I2C] tbase = %04x\n", iip->iic_tbase)); | |
275 | PRINTD(("[I2C] rxbd = %08x\n", (int)rxbd)); | |
276 | PRINTD(("[I2C] txbd = %08x\n", (int)txbd)); | |
277 | ||
278 | /* Set big endian byte order */ | |
279 | iip->iic_tfcr = 0x10; | |
280 | iip->iic_rfcr = 0x10; | |
281 | ||
282 | /* Set maximum receive size. */ | |
283 | iip->iic_mrblr = I2C_RXTX_LEN; | |
284 | ||
6d0f6bcf | 285 | #ifdef CONFIG_SYS_I2C_UCODE_PATCH |
62219a28 WD |
286 | /* |
287 | * Initialize required parameters if using microcode patch. | |
288 | */ | |
289 | iip->iic_rbptr = iip->iic_rbase; | |
290 | iip->iic_tbptr = iip->iic_tbase; | |
291 | iip->iic_rstate = 0; | |
292 | iip->iic_tstate = 0; | |
293 | #else | |
294 | cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_I2C, CPM_CR_INIT_TRX) | CPM_CR_FLG; | |
295 | do { | |
296 | __asm__ __volatile__ ("eieio"); | |
297 | } while (cp->cp_cpcr & CPM_CR_FLG); | |
298 | #endif | |
299 | ||
300 | /* Clear events and interrupts */ | |
301 | i2c->i2c_i2cer = 0xff; | |
302 | i2c->i2c_i2cmr = 0x00; | |
303 | } | |
304 | ||
305 | static void | |
306 | i2c_newio(i2c_state_t *state) | |
307 | { | |
6d0f6bcf | 308 | volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR ; |
62219a28 WD |
309 | volatile cpm8xx_t *cp = (cpm8xx_t *)&immap->im_cpm; |
310 | volatile iic_t *iip = (iic_t *)&cp->cp_dparam[PROFF_IIC]; | |
311 | ||
312 | PRINTD(("[I2C] i2c_newio\n")); | |
313 | ||
6d0f6bcf | 314 | #ifdef CONFIG_SYS_I2C_UCODE_PATCH |
62219a28 WD |
315 | iip = (iic_t *)&cp->cp_dpmem[iip->iic_rpbase]; |
316 | #endif | |
317 | state->rx_idx = 0; | |
318 | state->tx_idx = 0; | |
319 | state->rxbd = (void*)&cp->cp_dpmem[iip->iic_rbase]; | |
320 | state->txbd = (void*)&cp->cp_dpmem[iip->iic_tbase]; | |
321 | state->tx_space = MAX_TX_SPACE; | |
322 | state->tx_buf = (uchar*)state->txbd + NUM_TX_BDS * sizeof(I2C_BD); | |
323 | state->err_cb = NULL; | |
324 | ||
325 | PRINTD(("[I2C] rxbd = %08x\n", (int)state->rxbd)); | |
326 | PRINTD(("[I2C] txbd = %08x\n", (int)state->txbd)); | |
327 | PRINTD(("[I2C] tx_buf = %08x\n", (int)state->tx_buf)); | |
328 | ||
329 | /* clear the buffer memory */ | |
330 | memset((char *)state->tx_buf, 0, MAX_TX_SPACE); | |
331 | } | |
332 | ||
333 | static int | |
334 | i2c_send(i2c_state_t *state, | |
335 | unsigned char address, | |
336 | unsigned char secondary_address, | |
337 | unsigned int flags, | |
338 | unsigned short size, | |
339 | unsigned char *dataout) | |
340 | { | |
341 | volatile I2C_BD *txbd; | |
342 | int i,j; | |
343 | ||
344 | PRINTD(("[I2C] i2c_send add=%02d sec=%02d flag=%02d size=%d\n", | |
345 | address, secondary_address, flags, size)); | |
346 | ||
347 | /* trying to send message larger than BD */ | |
348 | if (size > I2C_RXTX_LEN) | |
349 | return I2CERR_MSG_TOO_LONG; | |
350 | ||
351 | /* no more free bds */ | |
352 | if (state->tx_idx >= NUM_TX_BDS || state->tx_space < (2 + size)) | |
353 | return I2CERR_NO_BUFFERS; | |
354 | ||
355 | txbd = (I2C_BD *)state->txbd; | |
356 | txbd->addr = state->tx_buf; | |
357 | ||
358 | PRINTD(("[I2C] txbd = %08x\n", (int)txbd)); | |
359 | ||
360 | if (flags & I2CF_START_COND) { | |
361 | PRINTD(("[I2C] Formatting addresses...\n")); | |
362 | if (flags & I2CF_ENABLE_SECONDARY) { | |
363 | txbd->length = size + 2; /* Length of msg + dest addr */ | |
364 | txbd->addr[0] = address << 1; | |
365 | txbd->addr[1] = secondary_address; | |
366 | i = 2; | |
367 | } else { | |
368 | txbd->length = size + 1; /* Length of msg + dest addr */ | |
369 | txbd->addr[0] = address << 1; /* Write dest addr to BD */ | |
370 | i = 1; | |
371 | } | |
372 | } else { | |
373 | txbd->length = size; /* Length of message */ | |
374 | i = 0; | |
375 | } | |
376 | ||
377 | /* set up txbd */ | |
378 | txbd->status = BD_SC_READY; | |
379 | if (flags & I2CF_START_COND) | |
380 | txbd->status |= BD_I2C_TX_START; | |
381 | if (flags & I2CF_STOP_COND) | |
382 | txbd->status |= BD_SC_LAST | BD_SC_WRAP; | |
383 | ||
384 | /* Copy data to send into buffer */ | |
385 | PRINTD(("[I2C] copy data...\n")); | |
386 | for(j = 0; j < size; i++, j++) | |
387 | txbd->addr[i] = dataout[j]; | |
388 | ||
389 | PRINTD(("[I2C] txbd: length=0x%04x status=0x%04x addr[0]=0x%02x addr[1]=0x%02x\n", | |
390 | txbd->length, | |
391 | txbd->status, | |
392 | txbd->addr[0], | |
393 | txbd->addr[1])); | |
394 | ||
395 | /* advance state */ | |
396 | state->tx_buf += txbd->length; | |
397 | state->tx_space -= txbd->length; | |
398 | state->tx_idx++; | |
399 | state->txbd = (void*)(txbd + 1); | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | static int | |
405 | i2c_receive(i2c_state_t *state, | |
406 | unsigned char address, | |
407 | unsigned char secondary_address, | |
408 | unsigned int flags, | |
409 | unsigned short size_to_expect, | |
410 | unsigned char *datain) | |
411 | { | |
412 | volatile I2C_BD *rxbd, *txbd; | |
413 | ||
414 | PRINTD(("[I2C] i2c_receive %02d %02d %02d\n", address, secondary_address, flags)); | |
415 | ||
416 | /* Expected to receive too much */ | |
417 | if (size_to_expect > I2C_RXTX_LEN) | |
418 | return I2CERR_MSG_TOO_LONG; | |
419 | ||
420 | /* no more free bds */ | |
421 | if (state->tx_idx >= NUM_TX_BDS || state->rx_idx >= NUM_RX_BDS | |
422 | || state->tx_space < 2) | |
423 | return I2CERR_NO_BUFFERS; | |
424 | ||
425 | rxbd = (I2C_BD *)state->rxbd; | |
426 | txbd = (I2C_BD *)state->txbd; | |
427 | ||
428 | PRINTD(("[I2C] rxbd = %08x\n", (int)rxbd)); | |
429 | PRINTD(("[I2C] txbd = %08x\n", (int)txbd)); | |
430 | ||
431 | txbd->addr = state->tx_buf; | |
432 | ||
433 | /* set up TXBD for destination address */ | |
434 | if (flags & I2CF_ENABLE_SECONDARY) { | |
435 | txbd->length = 2; | |
436 | txbd->addr[0] = address << 1; /* Write data */ | |
437 | txbd->addr[1] = secondary_address; /* Internal address */ | |
438 | txbd->status = BD_SC_READY; | |
439 | } else { | |
440 | txbd->length = 1 + size_to_expect; | |
441 | txbd->addr[0] = (address << 1) | 0x01; | |
442 | txbd->status = BD_SC_READY; | |
443 | memset(&txbd->addr[1], 0, txbd->length); | |
444 | } | |
445 | ||
446 | /* set up rxbd for reception */ | |
447 | rxbd->status = BD_SC_EMPTY; | |
448 | rxbd->length = size_to_expect; | |
449 | rxbd->addr = datain; | |
450 | ||
451 | txbd->status |= BD_I2C_TX_START; | |
452 | if (flags & I2CF_STOP_COND) { | |
453 | txbd->status |= BD_SC_LAST | BD_SC_WRAP; | |
454 | rxbd->status |= BD_SC_WRAP; | |
455 | } | |
456 | ||
457 | PRINTD(("[I2C] txbd: length=0x%04x status=0x%04x addr[0]=0x%02x addr[1]=0x%02x\n", | |
458 | txbd->length, | |
459 | txbd->status, | |
460 | txbd->addr[0], | |
461 | txbd->addr[1])); | |
462 | PRINTD(("[I2C] rxbd: length=0x%04x status=0x%04x addr[0]=0x%02x addr[1]=0x%02x\n", | |
463 | rxbd->length, | |
464 | rxbd->status, | |
465 | rxbd->addr[0], | |
466 | rxbd->addr[1])); | |
467 | ||
468 | /* advance state */ | |
469 | state->tx_buf += txbd->length; | |
470 | state->tx_space -= txbd->length; | |
471 | state->tx_idx++; | |
472 | state->txbd = (void*)(txbd + 1); | |
473 | state->rx_idx++; | |
474 | state->rxbd = (void*)(rxbd + 1); | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | ||
480 | static int i2c_doio(i2c_state_t *state) | |
481 | { | |
6d0f6bcf | 482 | volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR ; |
62219a28 WD |
483 | volatile cpm8xx_t *cp = (cpm8xx_t *)&immap->im_cpm; |
484 | volatile i2c8xx_t *i2c = (i2c8xx_t *)&immap->im_i2c; | |
485 | volatile iic_t *iip = (iic_t *)&cp->cp_dparam[PROFF_IIC]; | |
486 | volatile I2C_BD *txbd, *rxbd; | |
487 | volatile int j = 0; | |
488 | ||
489 | PRINTD(("[I2C] i2c_doio\n")); | |
490 | ||
6d0f6bcf | 491 | #ifdef CONFIG_SYS_I2C_UCODE_PATCH |
62219a28 WD |
492 | iip = (iic_t *)&cp->cp_dpmem[iip->iic_rpbase]; |
493 | #endif | |
494 | ||
495 | if (state->tx_idx <= 0 && state->rx_idx <= 0) { | |
496 | PRINTD(("[I2C] No I/O is queued\n")); | |
497 | return I2CERR_QUEUE_EMPTY; | |
498 | } | |
499 | ||
500 | iip->iic_rbptr = iip->iic_rbase; | |
501 | iip->iic_tbptr = iip->iic_tbase; | |
502 | ||
503 | /* Enable I2C */ | |
504 | PRINTD(("[I2C] Enabling I2C...\n")); | |
505 | i2c->i2c_i2mod |= 0x01; | |
506 | ||
507 | /* Begin transmission */ | |
508 | i2c->i2c_i2com |= 0x80; | |
509 | ||
510 | /* Loop until transmit & receive completed */ | |
511 | ||
512 | if (state->tx_idx > 0) { | |
513 | txbd = ((I2C_BD*)state->txbd) - 1; | |
514 | PRINTD(("[I2C] Transmitting...(txbd=0x%08lx)\n", (ulong)txbd)); | |
515 | while((txbd->status & BD_SC_READY) && (j++ < TOUT_LOOP)) { | |
516 | if (ctrlc()) { | |
517 | return (-1); | |
518 | } | |
519 | __asm__ __volatile__ ("eieio"); | |
520 | } | |
521 | } | |
522 | ||
523 | if ((state->rx_idx > 0) && (j < TOUT_LOOP)) { | |
524 | rxbd = ((I2C_BD*)state->rxbd) - 1; | |
525 | PRINTD(("[I2C] Receiving...(rxbd=0x%08lx)\n", (ulong)rxbd)); | |
526 | while((rxbd->status & BD_SC_EMPTY) && (j++ < TOUT_LOOP)) { | |
527 | if (ctrlc()) { | |
528 | return (-1); | |
529 | } | |
530 | __asm__ __volatile__ ("eieio"); | |
531 | } | |
532 | } | |
533 | ||
534 | /* Turn off I2C */ | |
535 | i2c->i2c_i2mod &= ~0x01; | |
536 | ||
537 | if (state->err_cb != NULL) { | |
538 | int n, i, b; | |
539 | ||
540 | /* | |
541 | * if we have an error callback function, look at the | |
542 | * error bits in the bd status and pass them back | |
543 | */ | |
544 | ||
545 | if ((n = state->tx_idx) > 0) { | |
546 | for (i = 0; i < n; i++) { | |
547 | txbd = ((I2C_BD*)state->txbd) - (n - i); | |
548 | if ((b = txbd->status & BD_I2C_TX_ERR) != 0) | |
549 | (*state->err_cb)(I2CECB_TX_ERR|b, i); | |
550 | } | |
551 | } | |
552 | ||
553 | if ((n = state->rx_idx) > 0) { | |
554 | for (i = 0; i < n; i++) { | |
555 | rxbd = ((I2C_BD*)state->rxbd) - (n - i); | |
556 | if ((b = rxbd->status & BD_I2C_RX_ERR) != 0) | |
557 | (*state->err_cb)(I2CECB_RX_ERR|b, i); | |
558 | } | |
559 | } | |
560 | ||
561 | if (j >= TOUT_LOOP) | |
562 | (*state->err_cb)(I2CECB_TIMEOUT, 0); | |
563 | } | |
564 | ||
565 | return (j >= TOUT_LOOP) ? I2CERR_TIMEOUT : 0; | |
566 | } | |
567 | ||
568 | static int had_tx_nak; | |
569 | ||
570 | static void | |
571 | i2c_test_callback(int flags, int xnum) | |
572 | { | |
573 | if ((flags & I2CECB_TX_ERR) && (flags & I2CECB_TX_NAK)) | |
574 | had_tx_nak = 1; | |
575 | } | |
576 | ||
577 | int i2c_probe(uchar chip) | |
578 | { | |
579 | i2c_state_t state; | |
53677ef1 | 580 | int rc; |
62219a28 WD |
581 | uchar buf[1]; |
582 | ||
6d0f6bcf | 583 | i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); |
62219a28 WD |
584 | |
585 | i2c_newio(&state); | |
586 | ||
587 | state.err_cb = i2c_test_callback; | |
588 | had_tx_nak = 0; | |
589 | ||
590 | rc = i2c_receive(&state, chip, 0, I2CF_START_COND|I2CF_STOP_COND, 1, buf); | |
591 | ||
592 | if (rc != 0) | |
593 | return (rc); | |
594 | ||
595 | rc = i2c_doio(&state); | |
596 | ||
597 | if ((rc != 0) && (rc != I2CERR_TIMEOUT)) | |
598 | return (rc); | |
599 | ||
600 | return (had_tx_nak); | |
601 | } | |
602 | ||
603 | int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) | |
604 | { | |
62219a28 WD |
605 | i2c_state_t state; |
606 | uchar xaddr[4]; | |
607 | int rc; | |
608 | ||
609 | #ifdef CONFIG_LWMON | |
610 | WATCHDOG_RESET(); | |
611 | #endif | |
612 | ||
613 | xaddr[0] = (addr >> 24) & 0xFF; | |
614 | xaddr[1] = (addr >> 16) & 0xFF; | |
615 | xaddr[2] = (addr >> 8) & 0xFF; | |
616 | xaddr[3] = addr & 0xFF; | |
617 | ||
6d0f6bcf | 618 | #ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW |
62219a28 WD |
619 | /* |
620 | * EEPROM chips that implement "address overflow" are ones like | |
621 | * Catalyst 24WC04/08/16 which has 9/10/11 bits of address and the | |
622 | * extra bits end up in the "chip address" bit slots. This makes | |
623 | * a 24WC08 (1Kbyte) chip look like four 256 byte chips. | |
624 | * | |
625 | * Note that we consider the length of the address field to still | |
626 | * be one byte because the extra address bits are hidden in the | |
627 | * chip address. | |
628 | */ | |
6d0f6bcf | 629 | chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); |
62219a28 WD |
630 | #endif |
631 | ||
632 | i2c_newio(&state); | |
633 | ||
634 | rc = i2c_send(&state, chip, 0, I2CF_START_COND, alen, &xaddr[4-alen]); | |
635 | if (rc != 0) { | |
636 | if (gd->have_console) | |
637 | printf("i2c_read: i2c_send failed (%d)\n", rc); | |
638 | return 1; | |
639 | } | |
640 | ||
641 | rc = i2c_receive(&state, chip, 0, I2CF_STOP_COND, len, buffer); | |
642 | if (rc != 0) { | |
643 | if (gd->have_console) | |
644 | printf("i2c_read: i2c_receive failed (%d)\n", rc); | |
645 | return 1; | |
646 | } | |
647 | ||
648 | rc = i2c_doio(&state); | |
649 | if (rc != 0) { | |
650 | if (gd->have_console) | |
651 | printf("i2c_read: i2c_doio failed (%d)\n", rc); | |
652 | return 1; | |
653 | } | |
654 | return 0; | |
655 | } | |
656 | ||
657 | int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) | |
658 | { | |
62219a28 WD |
659 | i2c_state_t state; |
660 | uchar xaddr[4]; | |
661 | int rc; | |
662 | ||
663 | xaddr[0] = (addr >> 24) & 0xFF; | |
664 | xaddr[1] = (addr >> 16) & 0xFF; | |
665 | xaddr[2] = (addr >> 8) & 0xFF; | |
666 | xaddr[3] = addr & 0xFF; | |
667 | ||
6d0f6bcf | 668 | #ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW |
62219a28 WD |
669 | /* |
670 | * EEPROM chips that implement "address overflow" are ones like | |
671 | * Catalyst 24WC04/08/16 which has 9/10/11 bits of address and the | |
672 | * extra bits end up in the "chip address" bit slots. This makes | |
673 | * a 24WC08 (1Kbyte) chip look like four 256 byte chips. | |
674 | * | |
675 | * Note that we consider the length of the address field to still | |
676 | * be one byte because the extra address bits are hidden in the | |
677 | * chip address. | |
678 | */ | |
6d0f6bcf | 679 | chip |= ((addr >> (alen * 8)) & CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW); |
62219a28 WD |
680 | #endif |
681 | ||
682 | i2c_newio(&state); | |
683 | ||
684 | rc = i2c_send(&state, chip, 0, I2CF_START_COND, alen, &xaddr[4-alen]); | |
685 | if (rc != 0) { | |
686 | if (gd->have_console) | |
687 | printf("i2c_write: first i2c_send failed (%d)\n", rc); | |
688 | return 1; | |
689 | } | |
690 | ||
691 | rc = i2c_send(&state, 0, 0, I2CF_STOP_COND, len, buffer); | |
692 | if (rc != 0) { | |
693 | if (gd->have_console) | |
694 | printf("i2c_write: second i2c_send failed (%d)\n", rc); | |
695 | return 1; | |
696 | } | |
697 | ||
698 | rc = i2c_doio(&state); | |
699 | if (rc != 0) { | |
700 | if (gd->have_console) | |
701 | printf("i2c_write: i2c_doio failed (%d)\n", rc); | |
702 | return 1; | |
703 | } | |
704 | return 0; | |
705 | } | |
706 | ||
62219a28 | 707 | #endif /* CONFIG_HARD_I2C */ |