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wdenk4a9cbbe2002-08-27 09:48:53 +00001/*
2 * (C) Copyright 2000
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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 * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00.
24 */
25
26/*
27 * Minimal serial functions needed to use one of the SCC ports
28 * as serial console interface.
29 */
30
31#include <common.h>
32#include <mpc8260.h>
33#include <asm/cpm_8260.h>
34
Wolfgang Denkd87080b2006-03-31 18:32:53 +020035DECLARE_GLOBAL_DATA_PTR;
36
wdenk4a9cbbe2002-08-27 09:48:53 +000037#if defined(CONFIG_CONS_ON_SCC)
38
39#if CONFIG_CONS_INDEX == 1 /* Console on SCC1 */
40
41#define SCC_INDEX 0
42#define PROFF_SCC PROFF_SCC1
43#define CMXSCR_MASK (CMXSCR_GR1|CMXSCR_SC1|\
44 CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK)
45#define CMXSCR_VALUE (CMXSCR_RS1CS_BRG1|CMXSCR_TS1CS_BRG1)
46#define CPM_CR_SCC_PAGE CPM_CR_SCC1_PAGE
47#define CPM_CR_SCC_SBLOCK CPM_CR_SCC1_SBLOCK
48
49#elif CONFIG_CONS_INDEX == 2 /* Console on SCC2 */
50
51#define SCC_INDEX 1
52#define PROFF_SCC PROFF_SCC2
53#define CMXSCR_MASK (CMXSCR_GR2|CMXSCR_SC2|\
54 CMXSCR_RS2CS_MSK|CMXSCR_TS2CS_MSK)
55#define CMXSCR_VALUE (CMXSCR_RS2CS_BRG2|CMXSCR_TS2CS_BRG2)
56#define CPM_CR_SCC_PAGE CPM_CR_SCC2_PAGE
57#define CPM_CR_SCC_SBLOCK CPM_CR_SCC2_SBLOCK
58
59#elif CONFIG_CONS_INDEX == 3 /* Console on SCC3 */
60
61#define SCC_INDEX 2
62#define PROFF_SCC PROFF_SCC3
63#define CMXSCR_MASK (CMXSCR_GR3|CMXSCR_SC3|\
64 CMXSCR_RS3CS_MSK|CMXSCR_TS3CS_MSK)
65#define CMXSCR_VALUE (CMXSCR_RS3CS_BRG3|CMXSCR_TS3CS_BRG3)
66#define CPM_CR_SCC_PAGE CPM_CR_SCC3_PAGE
67#define CPM_CR_SCC_SBLOCK CPM_CR_SCC3_SBLOCK
68
69#elif CONFIG_CONS_INDEX == 4 /* Console on SCC4 */
70
71#define SCC_INDEX 3
72#define PROFF_SCC PROFF_SCC4
73#define CMXSCR_MASK (CMXSCR_GR4|CMXSCR_SC4|\
74 CMXSCR_RS4CS_MSK|CMXSCR_TS4CS_MSK)
75#define CMXSCR_VALUE (CMXSCR_RS4CS_BRG4|CMXSCR_TS4CS_BRG4)
76#define CPM_CR_SCC_PAGE CPM_CR_SCC4_PAGE
77#define CPM_CR_SCC_SBLOCK CPM_CR_SCC4_SBLOCK
78
79#else
80
81#error "console not correctly defined"
82
83#endif
84
85int serial_init (void)
86{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020087 volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
wdenk4a9cbbe2002-08-27 09:48:53 +000088 volatile scc_t *sp;
89 volatile scc_uart_t *up;
90 volatile cbd_t *tbdf, *rbdf;
91 volatile cpm8260_t *cp = &(im->im_cpm);
92 uint dpaddr;
93
94 /* initialize pointers to SCC */
95
96 sp = (scc_t *) &(im->im_scc[SCC_INDEX]);
97 up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
98
99 /* Disable transmitter/receiver.
100 */
101 sp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
102
103 /* put the SCC channel into NMSI (non multiplexd serial interface)
104 * mode and wire the selected SCC Tx and Rx clocks to BRGx (15-15).
105 */
106 im->im_cpmux.cmx_scr = (im->im_cpmux.cmx_scr&~CMXSCR_MASK)|CMXSCR_VALUE;
107
108 /* Set up the baud rate generator.
109 */
110 serial_setbrg ();
111
112 /* Allocate space for two buffer descriptors in the DP ram.
113 * damm: allocating space after the two buffers for rx/tx data
114 */
115
116 dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
117
118 /* Set the physical address of the host memory buffers in
119 * the buffer descriptors.
120 */
121 rbdf = (cbd_t *)&im->im_dprambase[dpaddr];
122 rbdf->cbd_bufaddr = (uint) (rbdf+2);
123 rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
124 tbdf = rbdf + 1;
125 tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
126 tbdf->cbd_sc = BD_SC_WRAP;
127
128 /* Set up the uart parameters in the parameter ram.
129 */
130 up->scc_genscc.scc_rbase = dpaddr;
131 up->scc_genscc.scc_tbase = dpaddr+sizeof(cbd_t);
132 up->scc_genscc.scc_rfcr = CPMFCR_EB;
133 up->scc_genscc.scc_tfcr = CPMFCR_EB;
134 up->scc_genscc.scc_mrblr = 1;
135 up->scc_maxidl = 0;
136 up->scc_brkcr = 1;
137 up->scc_parec = 0;
138 up->scc_frmec = 0;
139 up->scc_nosec = 0;
140 up->scc_brkec = 0;
141 up->scc_uaddr1 = 0;
142 up->scc_uaddr2 = 0;
143 up->scc_toseq = 0;
144 up->scc_char1 = up->scc_char2 = up->scc_char3 = up->scc_char4 = 0x8000;
145 up->scc_char5 = up->scc_char6 = up->scc_char7 = up->scc_char8 = 0x8000;
146 up->scc_rccm = 0xc0ff;
147
148 /* Mask all interrupts and remove anything pending.
149 */
150 sp->scc_sccm = 0;
151 sp->scc_scce = 0xffff;
152
153 /* Set 8 bit FIFO, 16 bit oversampling and UART mode.
154 */
155 sp->scc_gsmrh = SCC_GSMRH_RFW; /* 8 bit FIFO */
156 sp->scc_gsmrl = \
157 SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART;
158
159 /* Set CTS flow control, 1 stop bit, 8 bit character length,
160 * normal async UART mode, no parity
161 */
162 sp->scc_psmr = SCU_PSMR_FLC | SCU_PSMR_CL;
163
164 /* execute the "Init Rx and Tx params" CP command.
165 */
166
167 while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
168 ;
169
170 cp->cp_cpcr = mk_cr_cmd(CPM_CR_SCC_PAGE, CPM_CR_SCC_SBLOCK,
171 0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
172
173 while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
174 ;
175
176 /* Enable transmitter/receiver.
177 */
178 sp->scc_gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT;
179
180 return (0);
181}
182
183void
184serial_setbrg (void)
185{
wdenk4a9cbbe2002-08-27 09:48:53 +0000186#if defined(CONFIG_CONS_USE_EXTC)
187 m8260_cpm_extcbrg(SCC_INDEX, gd->baudrate,
188 CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL);
189#else
190 m8260_cpm_setbrg(SCC_INDEX, gd->baudrate);
191#endif
192}
193
194void
195serial_putc(const char c)
196{
197 volatile scc_uart_t *up;
198 volatile cbd_t *tbdf;
wdenk8bde7f72003-06-27 21:31:46 +0000199 volatile immap_t *im;
wdenk4a9cbbe2002-08-27 09:48:53 +0000200
201 if (c == '\n')
202 serial_putc ('\r');
203
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200204 im = (immap_t *)CONFIG_SYS_IMMR;
wdenk4a9cbbe2002-08-27 09:48:53 +0000205 up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
206 tbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_tbase];
207
208 /* Wait for last character to go.
209 */
210 while (tbdf->cbd_sc & BD_SC_READY)
211 ;
212
213 /* Load the character into the transmit buffer.
214 */
215 *(volatile char *)tbdf->cbd_bufaddr = c;
216 tbdf->cbd_datlen = 1;
217 tbdf->cbd_sc |= BD_SC_READY;
218}
219
220void
221serial_puts (const char *s)
222{
223 while (*s) {
224 serial_putc (*s++);
225 }
226}
227
228int
229serial_getc(void)
230{
231 volatile cbd_t *rbdf;
232 volatile scc_uart_t *up;
wdenk8bde7f72003-06-27 21:31:46 +0000233 volatile immap_t *im;
wdenk4a9cbbe2002-08-27 09:48:53 +0000234 unsigned char c;
235
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200236 im = (immap_t *)CONFIG_SYS_IMMR;
wdenk4a9cbbe2002-08-27 09:48:53 +0000237 up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
238 rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
239
240 /* Wait for character to show up.
241 */
242 while (rbdf->cbd_sc & BD_SC_EMPTY)
243 ;
244
245 /* Grab the char and clear the buffer again.
246 */
247 c = *(volatile unsigned char *)rbdf->cbd_bufaddr;
248 rbdf->cbd_sc |= BD_SC_EMPTY;
249
250 return (c);
251}
252
253int
254serial_tstc()
255{
256 volatile cbd_t *rbdf;
257 volatile scc_uart_t *up;
wdenk8bde7f72003-06-27 21:31:46 +0000258 volatile immap_t *im;
wdenk4a9cbbe2002-08-27 09:48:53 +0000259
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200260 im = (immap_t *)CONFIG_SYS_IMMR;
wdenk4a9cbbe2002-08-27 09:48:53 +0000261 up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
262 rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
263
264 return ((rbdf->cbd_sc & BD_SC_EMPTY) == 0);
265}
266
267#endif /* CONFIG_CONS_ON_SCC */
268
269#if defined(CONFIG_KGDB_ON_SCC)
270
271#if defined(CONFIG_CONS_ON_SCC) && CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
272#error Whoops! serial console and kgdb are on the same scc serial port
273#endif
274
275#if CONFIG_KGDB_INDEX == 1 /* KGDB Port on SCC1 */
276
277#define KGDB_SCC_INDEX 0
278#define KGDB_PROFF_SCC PROFF_SCC1
279#define KGDB_CMXSCR_MASK (CMXSCR_GR1|CMXSCR_SC1|\
280 CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK)
281#define KGDB_CMXSCR_VALUE (CMXSCR_RS1CS_BRG1|CMXSCR_TS1CS_BRG1)
282#define KGDB_CPM_CR_SCC_PAGE CPM_CR_SCC1_PAGE
283#define KGDB_CPM_CR_SCC_SBLOCK CPM_CR_SCC1_SBLOCK
284
285#elif CONFIG_KGDB_INDEX == 2 /* KGDB Port on SCC2 */
286
287#define KGDB_SCC_INDEX 1
288#define KGDB_PROFF_SCC PROFF_SCC2
289#define KGDB_CMXSCR_MASK (CMXSCR_GR2|CMXSCR_SC2|\
290 CMXSCR_RS2CS_MSK|CMXSCR_TS2CS_MSK)
291#define KGDB_CMXSCR_VALUE (CMXSCR_RS2CS_BRG2|CMXSCR_TS2CS_BRG2)
292#define KGDB_CPM_CR_SCC_PAGE CPM_CR_SCC2_PAGE
293#define KGDB_CPM_CR_SCC_SBLOCK CPM_CR_SCC2_SBLOCK
294
295#elif CONFIG_KGDB_INDEX == 3 /* KGDB Port on SCC3 */
296
297#define KGDB_SCC_INDEX 2
298#define KGDB_PROFF_SCC PROFF_SCC3
299#define KGDB_CMXSCR_MASK (CMXSCR_GR3|CMXSCR_SC3|\
300 CMXSCR_RS3CS_MSK|CMXSCR_TS3CS_MSK)
301#define KGDB_CMXSCR_VALUE (CMXSCR_RS3CS_BRG3|CMXSCR_TS3CS_BRG3)
302#define KGDB_CPM_CR_SCC_PAGE CPM_CR_SCC3_PAGE
303#define KGDB_CPM_CR_SCC_SBLOCK CPM_CR_SCC3_SBLOCK
304
305#elif CONFIG_KGDB_INDEX == 4 /* KGDB Port on SCC4 */
306
307#define KGDB_SCC_INDEX 3
308#define KGDB_PROFF_SCC PROFF_SCC4
309#define KGDB_CMXSCR_MASK (CMXSCR_GR4|CMXSCR_SC4|\
310 CMXSCR_RS4CS_MSK|CMXSCR_TS4CS_MSK)
311#define KGDB_CMXSCR_VALUE (CMXSCR_RS4CS_BRG4|CMXSCR_TS4CS_BRG4)
312#define KGDB_CPM_CR_SCC_PAGE CPM_CR_SCC4_PAGE
313#define KGDB_CPM_CR_SCC_SBLOCK CPM_CR_SCC4_SBLOCK
314
315#else
316
317#error "kgdb serial port not correctly defined"
318
319#endif
320
321void
322kgdb_serial_init (void)
323{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200324 volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
wdenk4a9cbbe2002-08-27 09:48:53 +0000325 volatile scc_t *sp;
326 volatile scc_uart_t *up;
327 volatile cbd_t *tbdf, *rbdf;
328 volatile cpm8260_t *cp = &(im->im_cpm);
329 uint dpaddr, speed = CONFIG_KGDB_BAUDRATE;
330 char *s, *e;
331
332 if ((s = getenv("kgdbrate")) != NULL && *s != '\0') {
333 ulong rate = simple_strtoul(s, &e, 10);
334 if (e > s && *e == '\0')
335 speed = rate;
336 }
337
338 /* initialize pointers to SCC */
339
340 sp = (scc_t *) &(im->im_scc[KGDB_SCC_INDEX]);
341 up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
342
343 /* Disable transmitter/receiver.
344 */
345 sp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
346
347 /* put the SCC channel into NMSI (non multiplexd serial interface)
348 * mode and wire the selected SCC Tx and Rx clocks to BRGx (15-15).
349 */
350 im->im_cpmux.cmx_scr = \
351 (im->im_cpmux.cmx_scr & ~KGDB_CMXSCR_MASK) | KGDB_CMXSCR_VALUE;
352
353 /* Set up the baud rate generator.
354 */
355#if defined(CONFIG_KGDB_USE_EXTC)
356 m8260_cpm_extcbrg(KGDB_SCC_INDEX, speed,
357 CONFIG_KGDB_EXTC_RATE, CONFIG_KGDB_EXTC_PINSEL);
358#else
359 m8260_cpm_setbrg(KGDB_SCC_INDEX, speed);
360#endif
361
362 /* Allocate space for two buffer descriptors in the DP ram.
363 * damm: allocating space after the two buffers for rx/tx data
364 */
365
366 dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
367
368 /* Set the physical address of the host memory buffers in
369 * the buffer descriptors.
370 */
371 rbdf = (cbd_t *)&im->im_dprambase[dpaddr];
372 rbdf->cbd_bufaddr = (uint) (rbdf+2);
373 rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
374 tbdf = rbdf + 1;
375 tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
376 tbdf->cbd_sc = BD_SC_WRAP;
377
378 /* Set up the uart parameters in the parameter ram.
379 */
380 up->scc_genscc.scc_rbase = dpaddr;
381 up->scc_genscc.scc_tbase = dpaddr+sizeof(cbd_t);
382 up->scc_genscc.scc_rfcr = CPMFCR_EB;
383 up->scc_genscc.scc_tfcr = CPMFCR_EB;
384 up->scc_genscc.scc_mrblr = 1;
385 up->scc_maxidl = 0;
386 up->scc_brkcr = 1;
387 up->scc_parec = 0;
388 up->scc_frmec = 0;
389 up->scc_nosec = 0;
390 up->scc_brkec = 0;
391 up->scc_uaddr1 = 0;
392 up->scc_uaddr2 = 0;
393 up->scc_toseq = 0;
394 up->scc_char1 = up->scc_char2 = up->scc_char3 = up->scc_char4 = 0x8000;
395 up->scc_char5 = up->scc_char6 = up->scc_char7 = up->scc_char8 = 0x8000;
396 up->scc_rccm = 0xc0ff;
397
398 /* Mask all interrupts and remove anything pending.
399 */
400 sp->scc_sccm = 0;
401 sp->scc_scce = 0xffff;
402
403 /* Set 8 bit FIFO, 16 bit oversampling and UART mode.
404 */
405 sp->scc_gsmrh = SCC_GSMRH_RFW; /* 8 bit FIFO */
406 sp->scc_gsmrl = \
407 SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART;
408
409 /* Set CTS flow control, 1 stop bit, 8 bit character length,
410 * normal async UART mode, no parity
411 */
412 sp->scc_psmr = SCU_PSMR_FLC | SCU_PSMR_CL;
413
414 /* execute the "Init Rx and Tx params" CP command.
415 */
416
417 while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
418 ;
419
420 cp->cp_cpcr = mk_cr_cmd(KGDB_CPM_CR_SCC_PAGE, KGDB_CPM_CR_SCC_SBLOCK,
421 0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
422
423 while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
424 ;
425
426 /* Enable transmitter/receiver.
427 */
428 sp->scc_gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT;
429
430 printf("SCC%d at %dbps ", CONFIG_KGDB_INDEX, speed);
431}
432
433void
434putDebugChar(const char c)
435{
436 volatile scc_uart_t *up;
437 volatile cbd_t *tbdf;
wdenk8bde7f72003-06-27 21:31:46 +0000438 volatile immap_t *im;
wdenk4a9cbbe2002-08-27 09:48:53 +0000439
440 if (c == '\n')
441 putDebugChar ('\r');
442
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200443 im = (immap_t *)CONFIG_SYS_IMMR;
wdenk4a9cbbe2002-08-27 09:48:53 +0000444 up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
445 tbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_tbase];
446
447 /* Wait for last character to go.
448 */
449 while (tbdf->cbd_sc & BD_SC_READY)
450 ;
451
452 /* Load the character into the transmit buffer.
453 */
454 *(volatile char *)tbdf->cbd_bufaddr = c;
455 tbdf->cbd_datlen = 1;
456 tbdf->cbd_sc |= BD_SC_READY;
457}
458
459void
460putDebugStr (const char *s)
461{
462 while (*s) {
463 putDebugChar (*s++);
464 }
465}
466
467int
468getDebugChar(void)
469{
470 volatile cbd_t *rbdf;
471 volatile scc_uart_t *up;
wdenk8bde7f72003-06-27 21:31:46 +0000472 volatile immap_t *im;
wdenk4a9cbbe2002-08-27 09:48:53 +0000473 unsigned char c;
474
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200475 im = (immap_t *)CONFIG_SYS_IMMR;
wdenk4a9cbbe2002-08-27 09:48:53 +0000476 up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
477 rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
478
479 /* Wait for character to show up.
480 */
481 while (rbdf->cbd_sc & BD_SC_EMPTY)
482 ;
483
484 /* Grab the char and clear the buffer again.
485 */
486 c = *(volatile unsigned char *)rbdf->cbd_bufaddr;
487 rbdf->cbd_sc |= BD_SC_EMPTY;
488
489 return (c);
490}
491
492void
493kgdb_interruptible(int yes)
494{
495 return;
496}
497
498#endif /* CONFIG_KGDB_ON_SCC */