aboutsummaryrefslogtreecommitdiff
path: root/cpu/ppc4xx/4xx_uart.c
blob: 8de65425c97c130311fb87b6bd59692e2a421f80 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
/*
 * (C) Copyright 2000-2006
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * This source code is dual-licensed.  You may use it under the terms of the
 * GNU General Public License version 2, or under the license below.
 *
 * This source code has been made available to you by IBM on an AS-IS
 * basis.  Anyone receiving this source is licensed under IBM
 * copyrights to use it in any way he or she deems fit, including
 * copying it, modifying it, compiling it, and redistributing it either
 * with or without modifications.  No license under IBM patents or
 * patent applications is to be implied by the copyright license.
 *
 * Any user of this software should understand that IBM cannot provide
 * technical support for this software and will not be responsible for
 * any consequences resulting from the use of this software.
 *
 * Any person who transfers this source code or any derivative work
 * must include the IBM copyright notice, this paragraph, and the
 * preceding two paragraphs in the transferred software.
 *
 * COPYRIGHT   I B M   CORPORATION 1995
 * LICENSED MATERIAL  -  PROGRAM PROPERTY OF I B M
 */

#include <common.h>
#include <commproc.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <watchdog.h>
#include <ppc4xx.h>

#ifdef CONFIG_SERIAL_MULTI
#include <serial.h>
#endif

#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
#include <malloc.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || \
    defined(CONFIG_405EP) || defined(CONFIG_405EZ) || \
    defined(CONFIG_405EX) || defined(CONFIG_440)

#if defined(CONFIG_440)
#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \
    defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \
    defined(CONFIG_460EX) || defined(CONFIG_460GT)
#define UART0_BASE	(CONFIG_SYS_PERIPHERAL_BASE + 0x00000300)
#define UART1_BASE	(CONFIG_SYS_PERIPHERAL_BASE + 0x00000400)
#else
#define UART0_BASE	(CONFIG_SYS_PERIPHERAL_BASE + 0x00000200)
#define UART1_BASE	(CONFIG_SYS_PERIPHERAL_BASE + 0x00000300)
#endif

#if defined(CONFIG_440SP) || defined(CONFIG_440SPE)
#define UART2_BASE	(CONFIG_SYS_PERIPHERAL_BASE + 0x00000600)
#endif

#if defined(CONFIG_460EX) || defined(CONFIG_460GT)
#define UART2_BASE	(CONFIG_SYS_PERIPHERAL_BASE + 0x00000500)
#define UART3_BASE	(CONFIG_SYS_PERIPHERAL_BASE + 0x00000600)
#endif

#if defined(CONFIG_440GP)
#define CR0_MASK        0x3fff0000
#define CR0_EXTCLK_ENA  0x00600000
#define CR0_UDIV_POS    16
#define UDIV_SUBTRACT	1
#define UART0_SDR	CPC0_CR0
#define MFREG(a, d)	d = mfdcr(a)
#define MTREG(a, d)	mtdcr(a, d)
#else /* #if defined(CONFIG_440GP) */
/* all other 440 PPC's access clock divider via sdr register */
#define CR0_MASK        0xdfffffff
#define CR0_EXTCLK_ENA  0x00800000
#define CR0_UDIV_POS    0
#define UDIV_SUBTRACT	0
#define UART0_SDR	SDR0_UART0
#define UART1_SDR	SDR0_UART1
#if defined(CONFIG_440EP) || defined(CONFIG_440EPX) || \
    defined(CONFIG_440GR) || defined(CONFIG_440GRX) || \
    defined(CONFIG_440SP) || defined(CONFIG_440SPE) || \
    defined(CONFIG_460EX) || defined(CONFIG_460GT)
#define UART2_SDR	SDR0_UART2
#endif
#if defined(CONFIG_440EP) || defined(CONFIG_440EPX) || \
    defined(CONFIG_440GR) || defined(CONFIG_440GRX) || \
    defined(CONFIG_460EX) || defined(CONFIG_460GT)
#define UART3_SDR	SDR0_UART3
#endif
#define MFREG(a, d)	mfsdr(a, d)
#define MTREG(a, d)	mtsdr(a, d)
#endif /* #if defined(CONFIG_440GP) */
#elif defined(CONFIG_405EP) || defined(CONFIG_405EZ)
#define UART0_BASE      0xef600300
#define UART1_BASE      0xef600400
#define UCR0_MASK       0x0000007f
#define UCR1_MASK       0x00007f00
#define UCR0_UDIV_POS   0
#define UCR1_UDIV_POS   8
#define UDIV_MAX        127
#elif defined(CONFIG_405EX)
#define UART0_BASE	0xef600200
#define UART1_BASE	0xef600300
#define CR0_MASK	0x000000ff
#define CR0_EXTCLK_ENA	0x00800000
#define CR0_UDIV_POS	0
#define UDIV_SUBTRACT	0
#define UART0_SDR	SDR0_UART0
#define UART1_SDR	SDR0_UART1
#else /* CONFIG_405GP || CONFIG_405CR */
#define UART0_BASE      0xef600300
#define UART1_BASE      0xef600400
#define CR0_MASK        0x00001fff
#define CR0_EXTCLK_ENA  0x000000c0
#define CR0_UDIV_POS    1
#define UDIV_MAX        32
#endif

/* using serial port 0 or 1 as U-Boot console ? */
#if defined(CONFIG_UART1_CONSOLE)
#define ACTING_UART0_BASE	UART1_BASE
#define ACTING_UART1_BASE	UART0_BASE
#else
#define ACTING_UART0_BASE	UART0_BASE
#define ACTING_UART1_BASE	UART1_BASE
#endif

#if defined(CONFIG_405EP) && defined(CONFIG_SYS_EXT_SERIAL_CLOCK)
#error "External serial clock not supported on AMCC PPC405EP!"
#endif

#define UART_RBR    0x00
#define UART_THR    0x00
#define UART_IER    0x01
#define UART_IIR    0x02
#define UART_FCR    0x02
#define UART_LCR    0x03
#define UART_MCR    0x04
#define UART_LSR    0x05
#define UART_MSR    0x06
#define UART_SCR    0x07
#define UART_DLL    0x00
#define UART_DLM    0x01

/*-----------------------------------------------------------------------------+
  | Line Status Register.
  +-----------------------------------------------------------------------------*/
#define asyncLSRDataReady1            0x01
#define asyncLSROverrunError1         0x02
#define asyncLSRParityError1          0x04
#define asyncLSRFramingError1         0x08
#define asyncLSRBreakInterrupt1       0x10
#define asyncLSRTxHoldEmpty1          0x20
#define asyncLSRTxShiftEmpty1         0x40
#define asyncLSRRxFifoError1          0x80

#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
/*-----------------------------------------------------------------------------+
  | Fifo
  +-----------------------------------------------------------------------------*/
typedef struct {
	char *rx_buffer;
	ulong rx_put;
	ulong rx_get;
} serial_buffer_t;

volatile static serial_buffer_t buf_info;
#endif

static void serial_init_common(u32 base, u32 udiv, u16 bdiv)
{
	PPC4xx_SYS_INFO sys_info;
	u8 val;

	get_sys_info(&sys_info);

	/* Correct UART frequency in bd-info struct now that
	 * the UART divisor is available
	 */
#ifdef CONFIG_SYS_EXT_SERIAL_CLOCK
	gd->uart_clk = CONFIG_SYS_EXT_SERIAL_CLOCK;
#else
	gd->uart_clk = sys_info.freqUART / udiv;
#endif

	out_8((u8 *)base + UART_LCR, 0x80);	/* set DLAB bit */
	out_8((u8 *)base + UART_DLL, bdiv);	/* set baudrate divisor */
	out_8((u8 *)base + UART_DLM, bdiv >> 8); /* set baudrate divisor */
	out_8((u8 *)base + UART_LCR, 0x03);	/* clear DLAB; set 8 bits, no parity */
	out_8((u8 *)base + UART_FCR, 0x00);	/* disable FIFO */
	out_8((u8 *)base + UART_MCR, 0x00);	/* no modem control DTR RTS */
	val = in_8((u8 *)base + UART_LSR);	/* clear line status */
	val = in_8((u8 *)base + UART_RBR);	/* read receive buffer */
	out_8((u8 *)base + UART_SCR, 0x00);	/* set scratchpad */
	out_8((u8 *)base + UART_IER, 0x00);	/* set interrupt enable reg */
}

#if (defined(CONFIG_440) || defined(CONFIG_405EX)) &&	\
    !defined(CONFIG_SYS_EXT_SERIAL_CLOCK)
static void serial_divs (int baudrate, unsigned long *pudiv,
			 unsigned short *pbdiv)
{
	sys_info_t sysinfo;
	unsigned long div;		/* total divisor udiv * bdiv */
	unsigned long umin;		/* minimum udiv	*/
	unsigned short diff;		/* smallest diff */
	unsigned long udiv;		/* best udiv */
	unsigned short idiff;		/* current diff */
	unsigned short ibdiv;		/* current bdiv */
	unsigned long i;
	unsigned long est;		/* current estimate */

	get_sys_info(&sysinfo);

	udiv = 32;			/* Assume lowest possible serial clk */
	div = sysinfo.freqPLB / (16 * baudrate); /* total divisor */
	umin = sysinfo.pllOpbDiv << 1;	/* 2 x OPB divisor */
	diff = 32;			/* highest possible */

	/* i is the test udiv value -- start with the largest
	 * possible (32) to minimize serial clock and constrain
	 * search to umin.
	 */
	for (i = 32; i > umin; i--) {
		ibdiv = div / i;
		est = i * ibdiv;
		idiff = (est > div) ? (est-div) : (div-est);
		if (idiff == 0) {
			udiv = i;
			break;      /* can't do better */
		} else if (idiff < diff) {
			udiv = i;       /* best so far */
			diff = idiff;   /* update lowest diff*/
		}
	}

	*pudiv = udiv;
	*pbdiv = div / udiv;
}

#elif defined(CONFIG_405EZ)

static void serial_divs (int baudrate, unsigned long *pudiv,
			 unsigned short *pbdiv)
{
	sys_info_t sysinfo;
	unsigned long div;		/* total divisor udiv * bdiv */
	unsigned long umin;		/* minimum udiv	*/
	unsigned short diff;		/* smallest diff */
	unsigned long udiv;		/* best udiv */
	unsigned short idiff;		/* current diff */
	unsigned short ibdiv;		/* current bdiv */
	unsigned long i;
	unsigned long est;		/* current estimate */
	unsigned long plloutb;
	unsigned long cpr_pllc;
	u32 reg;

	/* check the pll feedback source */
	mfcpr(CPR0_PLLC, cpr_pllc);

	get_sys_info(&sysinfo);

	plloutb = ((CONFIG_SYS_CLK_FREQ * ((cpr_pllc & PLLC_SRC_MASK) ?
					   sysinfo.pllFwdDivB : sysinfo.pllFwdDiv) *
		    sysinfo.pllFbkDiv) / sysinfo.pllFwdDivB);
	udiv = 256;			/* Assume lowest possible serial clk */
	div = plloutb / (16 * baudrate); /* total divisor */
	umin = (plloutb / get_OPB_freq()) << 1;	/* 2 x OPB divisor */
	diff = 256;			/* highest possible */

	/* i is the test udiv value -- start with the largest
	 * possible (256) to minimize serial clock and constrain
	 * search to umin.
	 */
	for (i = 256; i > umin; i--) {
		ibdiv = div / i;
		est = i * ibdiv;
		idiff = (est > div) ? (est-div) : (div-est);
		if (idiff == 0) {
			udiv = i;
			break;      /* can't do better */
		} else if (idiff < diff) {
			udiv = i;       /* best so far */
			diff = idiff;   /* update lowest diff*/
		}
	}

	*pudiv = udiv;
	mfcpr(CPC0_PERD0, reg);
	reg &= ~0x0000ffff;
	reg |= ((udiv - 0) << 8) | (udiv - 0);
	mtcpr(CPC0_PERD0, reg);
	*pbdiv = div / udiv;
}
#endif /* defined(CONFIG_440) && !defined(CONFIG_SYS_EXT_SERIAL_CLK) */

/*
 * Minimal serial functions needed to use one of the SMC ports
 * as serial console interface.
 */

#if defined(CONFIG_440)
int serial_init_dev(unsigned long base)
{
	unsigned long reg;
	unsigned long udiv;
	unsigned short bdiv;
#ifdef CONFIG_SYS_EXT_SERIAL_CLOCK
	unsigned long tmp;
#endif

	MFREG(UART0_SDR, reg);
	reg &= ~CR0_MASK;

#ifdef CONFIG_SYS_EXT_SERIAL_CLOCK
	reg |= CR0_EXTCLK_ENA;
	udiv = 1;
	tmp  = gd->baudrate * 16;
	bdiv = (CONFIG_SYS_EXT_SERIAL_CLOCK + tmp / 2) / tmp;
#else
	/* For 440, the cpu clock is on divider chain A, UART on divider
	 * chain B ... so cpu clock is irrelevant. Get the "optimized"
	 * values that are subject to the 1/2 opb clock constraint
	 */
	serial_divs (gd->baudrate, &udiv, &bdiv);
#endif

	reg |= (udiv - UDIV_SUBTRACT) << CR0_UDIV_POS;	/* set the UART divisor */

	/*
	 * Configure input clock to baudrate generator for all
	 * available serial ports here
	 */
	MTREG(UART0_SDR, reg);
#if defined(UART1_SDR)
	MTREG(UART1_SDR, reg);
#endif
#if defined(UART2_SDR)
	MTREG(UART2_SDR, reg);
#endif
#if defined(UART3_SDR)
	MTREG(UART3_SDR, reg);
#endif

	serial_init_common(base, udiv, bdiv);

	return (0);
}

#else /* !defined(CONFIG_440) */

int serial_init_dev (unsigned long base)
{
	unsigned long reg;
	unsigned long tmp;
	unsigned long clk;
	unsigned long udiv;
	unsigned short bdiv;

#ifdef CONFIG_405EX
	clk = tmp = 0;
	mfsdr(UART0_SDR, reg);
	reg &= ~CR0_MASK;
#ifdef CONFIG_SYS_EXT_SERIAL_CLOCK
	reg |= CR0_EXTCLK_ENA;
	udiv = 1;
	tmp  = gd->baudrate * 16;
	bdiv = (CONFIG_SYS_EXT_SERIAL_CLOCK + tmp / 2) / tmp;
#else
	serial_divs(gd->baudrate, &udiv, &bdiv);
#endif
	reg |= (udiv - UDIV_SUBTRACT) << CR0_UDIV_POS;  /* set the UART divisor */

	/*
	 * Configure input clock to baudrate generator for all
	 * available serial ports here
	 */
	mtsdr(UART0_SDR, reg);

#if defined(UART1_SDR)
	mtsdr(UART1_SDR, reg);
#endif

#elif defined(CONFIG_405EZ)
	serial_divs(gd->baudrate, &udiv, &bdiv);
	clk = tmp = reg = 0;
#else
#ifdef CONFIG_405EP
	reg = mfdcr(CPC0_UCR) & ~(UCR0_MASK | UCR1_MASK);
	clk = gd->cpu_clk;
	tmp = CONFIG_SYS_BASE_BAUD * 16;
	udiv = (clk + tmp / 2) / tmp;
	if (udiv > UDIV_MAX)                    /* max. n bits for udiv */
		udiv = UDIV_MAX;
	reg |= (udiv) << UCR0_UDIV_POS;	        /* set the UART divisor */
	reg |= (udiv) << UCR1_UDIV_POS;	        /* set the UART divisor */
	mtdcr (CPC0_UCR, reg);
#else /* CONFIG_405EP */
	reg = mfdcr(CPC0_CR0) & ~CR0_MASK;
#ifdef CONFIG_SYS_EXT_SERIAL_CLOCK
	clk = CONFIG_SYS_EXT_SERIAL_CLOCK;
	udiv = 1;
	reg |= CR0_EXTCLK_ENA;
#else
	clk = gd->cpu_clk;
#ifdef CONFIG_SYS_405_UART_ERRATA_59
	udiv = 31;			/* Errata 59: stuck at 31 */
#else
	tmp = CONFIG_SYS_BASE_BAUD * 16;
	udiv = (clk + tmp / 2) / tmp;
	if (udiv > UDIV_MAX)                    /* max. n bits for udiv */
		udiv = UDIV_MAX;
#endif
#endif
	reg |= (udiv - 1) << CR0_UDIV_POS;	/* set the UART divisor */
	mtdcr (CPC0_CR0, reg);
#endif /* CONFIG_405EP */
	tmp = gd->baudrate * udiv * 16;
	bdiv = (clk + tmp / 2) / tmp;
#endif /* CONFIG_405EX */

	serial_init_common(base, udiv, bdiv);

	return (0);
}

#endif /* if defined(CONFIG_440) */

void serial_setbrg_dev(unsigned long base)
{
	serial_init_dev(base);
}

void serial_putc_dev(unsigned long base, const char c)
{
	int i;

	if (c == '\n')
		serial_putc_dev(base, '\r');

	/* check THRE bit, wait for transmiter available */
	for (i = 1; i < 3500; i++) {
		if ((in_8((u8 *)base + UART_LSR) & 0x20) == 0x20)
			break;
		udelay (100);
	}

	out_8((u8 *)base + UART_THR, c);	/* put character out */
}

void serial_puts_dev (unsigned long base, const char *s)
{
	while (*s)
		serial_putc_dev (base, *s++);
}

int serial_getc_dev (unsigned long base)
{
	unsigned char status = 0;

	while (1) {
#if defined(CONFIG_HW_WATCHDOG)
		WATCHDOG_RESET ();	/* Reset HW Watchdog, if needed */
#endif	/* CONFIG_HW_WATCHDOG */

		status = in_8((u8 *)base + UART_LSR);
		if ((status & asyncLSRDataReady1) != 0x0)
			break;

		if ((status & ( asyncLSRFramingError1 |
				asyncLSROverrunError1 |
				asyncLSRParityError1  |
				asyncLSRBreakInterrupt1 )) != 0) {
			out_8((u8 *)base + UART_LSR,
			      asyncLSRFramingError1 |
			      asyncLSROverrunError1 |
			      asyncLSRParityError1  |
			      asyncLSRBreakInterrupt1);
		}
	}

	return (0x000000ff & (int) in_8((u8 *)base));
}

int serial_tstc_dev (unsigned long base)
{
	unsigned char status;

	status = in_8((u8 *)base + UART_LSR);
	if ((status & asyncLSRDataReady1) != 0x0)
		return (1);

	if ((status & ( asyncLSRFramingError1 |
			asyncLSROverrunError1 |
			asyncLSRParityError1  |
			asyncLSRBreakInterrupt1 )) != 0) {
		out_8((u8 *)base + UART_LSR,
		      asyncLSRFramingError1 |
		      asyncLSROverrunError1 |
		      asyncLSRParityError1  |
		      asyncLSRBreakInterrupt1);
	}

	return 0;
}

#ifdef CONFIG_SERIAL_SOFTWARE_FIFO

void serial_isr (void *arg)
{
	int space;
	int c;
	const int rx_get = buf_info.rx_get;
	int rx_put = buf_info.rx_put;

	if (rx_get <= rx_put)
		space = CONFIG_SERIAL_SOFTWARE_FIFO - (rx_put - rx_get);
	else
		space = rx_get - rx_put;

	while (serial_tstc_dev (ACTING_UART0_BASE)) {
		c = serial_getc_dev (ACTING_UART0_BASE);
		if (space) {
			buf_info.rx_buffer[rx_put++] = c;
			space--;
		}
		if (rx_put == CONFIG_SERIAL_SOFTWARE_FIFO)
			rx_put = 0;
		if (space < CONFIG_SERIAL_SOFTWARE_FIFO / 4) {
			/* Stop flow by setting RTS inactive */
			out_8((u8 *)ACTING_UART0_BASE + UART_MCR,
			      in_8((u8 *)ACTING_UART0_BASE + UART_MCR) &
			      (0xFF ^ 0x02));
		}
	}
	buf_info.rx_put = rx_put;
}

void serial_buffered_init (void)
{
	serial_puts ("Switching to interrupt driven serial input mode.\n");
	buf_info.rx_buffer = malloc (CONFIG_SERIAL_SOFTWARE_FIFO);
	buf_info.rx_put = 0;
	buf_info.rx_get = 0;

	if (in_8((u8 *)ACTING_UART0_BASE + UART_MSR) & 0x10)
		serial_puts ("Check CTS signal present on serial port: OK.\n");
	else
		serial_puts ("WARNING: CTS signal not present on serial port.\n");

	irq_install_handler ( VECNUM_U0 /*UART0 */ /*int vec */ ,
			      serial_isr /*interrupt_handler_t *handler */ ,
			      (void *) &buf_info /*void *arg */ );

	/* Enable "RX Data Available" Interrupt on UART */
	out_8(ACTING_UART0_BASE + UART_IER, 0x01);
	/* Set DTR active */
	out_8(ACTING_UART0_BASE + UART_MCR,
	      in_8((u8 *)ACTING_UART0_BASE + UART_MCR) | 0x01);
	/* Start flow by setting RTS active */
	out_8(ACTING_UART0_BASE + UART_MCR,
	      in_8((u8 *)ACTING_UART0_BASE + UART_MCR) | 0x02);
	/* Setup UART FIFO: RX trigger level: 4 byte, Enable FIFO */
	out_8(ACTING_UART0_BASE + UART_FCR, (1 << 6) | 1);
}

void serial_buffered_putc (const char c)
{
	/* Wait for CTS */
#if defined(CONFIG_HW_WATCHDOG)
	while (!(in_8((u8 *)ACTING_UART0_BASE + UART_MSR) & 0x10))
		WATCHDOG_RESET ();
#else
	while (!(in_8((u8 *)ACTING_UART0_BASE + UART_MSR) & 0x10));
#endif
	serial_putc (c);
}

void serial_buffered_puts (const char *s)
{
	serial_puts (s);
}

int serial_buffered_getc (void)
{
	int space;
	int c;
	int rx_get = buf_info.rx_get;
	int rx_put;

#if defined(CONFIG_HW_WATCHDOG)
	while (rx_get == buf_info.rx_put)
		WATCHDOG_RESET ();
#else
	while (rx_get == buf_info.rx_put);
#endif
	c = buf_info.rx_buffer[rx_get++];
	if (rx_get == CONFIG_SERIAL_SOFTWARE_FIFO)
		rx_get = 0;
	buf_info.rx_get = rx_get;

	rx_put = buf_info.rx_put;
	if (rx_get <= rx_put)
		space = CONFIG_SERIAL_SOFTWARE_FIFO - (rx_put - rx_get);
	else
		space = rx_get - rx_put;

	if (space > CONFIG_SERIAL_SOFTWARE_FIFO / 2) {
		/* Start flow by setting RTS active */
		out_8(ACTING_UART0_BASE + UART_MCR,
		      in_8((u8 *)ACTING_UART0_BASE + UART_MCR) | 0x02);
	}

	return c;
}

int serial_buffered_tstc (void)
{
	return (buf_info.rx_get != buf_info.rx_put) ? 1 : 0;
}

#endif	/* CONFIG_SERIAL_SOFTWARE_FIFO */

#if defined(CONFIG_CMD_KGDB)
/*
  AS HARNOIS : according to CONFIG_KGDB_SER_INDEX kgdb uses serial port
  number 0 or number 1
  - if CONFIG_KGDB_SER_INDEX = 1 => serial port number 0 :
  configuration has been already done
  - if CONFIG_KGDB_SER_INDEX = 2 => serial port number 1 :
  configure port 1 for serial I/O with rate = CONFIG_KGDB_BAUDRATE
*/
#if (CONFIG_KGDB_SER_INDEX & 2)
void kgdb_serial_init (void)
{
	u8 val;
	u16 br_reg;

	get_clocks ();
	br_reg = (((((gd->cpu_clk / 16) / 18) * 10) / CONFIG_KGDB_BAUDRATE) +
		  5) / 10;
	/*
	 * Init onboard 16550 UART
	 */
	out_8((u8 *)ACTING_UART1_BASE + UART_LCR, 0x80);	/* set DLAB bit */
	out_8((u8 *)ACTING_UART1_BASE + UART_DLL, (br_reg & 0x00ff)); /* set divisor for 9600 baud */
	out_8((u8 *)ACTING_UART1_BASE + UART_DLM, ((br_reg & 0xff00) >> 8)); /* set divisor for 9600 baud */
	out_8((u8 *)ACTING_UART1_BASE + UART_LCR, 0x03);	/* line control 8 bits no parity */
	out_8((u8 *)ACTING_UART1_BASE + UART_FCR, 0x00);	/* disable FIFO */
	out_8((u8 *)ACTING_UART1_BASE + UART_MCR, 0x00);	/* no modem control DTR RTS */
	val = in_8((u8 *)ACTING_UART1_BASE + UART_LSR);		/* clear line status */
	val = in_8((u8 *)ACTING_UART1_BASE + UART_RBR);		/* read receive buffer */
	out_8((u8 *)ACTING_UART1_BASE + UART_SCR, 0x00);	/* set scratchpad */
	out_8((u8 *)ACTING_UART1_BASE + UART_IER, 0x00);	/* set interrupt enable reg */
}

void putDebugChar (const char c)
{
	if (c == '\n')
		serial_putc ('\r');

	out_8((u8 *)ACTING_UART1_BASE + UART_THR, c);	/* put character out */

	/* check THRE bit, wait for transfer done */
	while ((in_8((u8 *)ACTING_UART1_BASE + UART_LSR) & 0x20) != 0x20);
}

void putDebugStr (const char *s)
{
	while (*s)
		serial_putc (*s++);
}

int getDebugChar (void)
{
	unsigned char status = 0;

	while (1) {
		status = in_8((u8 *)ACTING_UART1_BASE + UART_LSR);
		if ((status & asyncLSRDataReady1) != 0x0)
			break;

		if ((status & (asyncLSRFramingError1 |
			       asyncLSROverrunError1 |
			       asyncLSRParityError1  |
			       asyncLSRBreakInterrupt1 )) != 0) {
			out_8((u8 *)ACTING_UART1_BASE + UART_LSR,
			      asyncLSRFramingError1 |
			      asyncLSROverrunError1 |
			      asyncLSRParityError1  |
			      asyncLSRBreakInterrupt1);
		}
	}

	return (0x000000ff & (int) in_8((u8 *)ACTING_UART1_BASE));
}

void kgdb_interruptible (int yes)
{
	return;
}

#else	/* ! (CONFIG_KGDB_SER_INDEX & 2) */

void kgdb_serial_init (void)
{
	serial_printf ("[on serial] ");
}

void putDebugChar (int c)
{
	serial_putc (c);
}

void putDebugStr (const char *str)
{
	serial_puts (str);
}

int getDebugChar (void)
{
	return serial_getc ();
}

void kgdb_interruptible (int yes)
{
	return;
}
#endif	/* (CONFIG_KGDB_SER_INDEX & 2) */
#endif


#if defined(CONFIG_SERIAL_MULTI)
int serial0_init(void)
{
	return (serial_init_dev(UART0_BASE));
}

int serial1_init(void)
{
	return (serial_init_dev(UART1_BASE));
}

void serial0_setbrg (void)
{
	serial_setbrg_dev(UART0_BASE);
}

void serial1_setbrg (void)
{
	serial_setbrg_dev(UART1_BASE);
}

void serial0_putc(const char c)
{
	serial_putc_dev(UART0_BASE,c);
}

void serial1_putc(const char c)
{
	serial_putc_dev(UART1_BASE, c);
}

void serial0_puts(const char *s)
{
	serial_puts_dev(UART0_BASE, s);
}

void serial1_puts(const char *s)
{
	serial_puts_dev(UART1_BASE, s);
}

int serial0_getc(void)
{
	return(serial_getc_dev(UART0_BASE));
}

int serial1_getc(void)
{
	return(serial_getc_dev(UART1_BASE));
}

int serial0_tstc(void)
{
	return (serial_tstc_dev(UART0_BASE));
}

int serial1_tstc(void)
{
	return (serial_tstc_dev(UART1_BASE));
}

struct serial_device serial0_device =
{
	"serial0",
	"UART0",
	serial0_init,
	serial0_setbrg,
	serial0_getc,
	serial0_tstc,
	serial0_putc,
	serial0_puts,
};

struct serial_device serial1_device =
{
	"serial1",
	"UART1",
	serial1_init,
	serial1_setbrg,
	serial1_getc,
	serial1_tstc,
	serial1_putc,
	serial1_puts,
};
#else
/*
 * Wrapper functions
 */
int serial_init(void)
{
	return serial_init_dev(ACTING_UART0_BASE);
}

void serial_setbrg(void)
{
	serial_setbrg_dev(ACTING_UART0_BASE);
}

void serial_putc(const char c)
{
	serial_putc_dev(ACTING_UART0_BASE, c);
}

void serial_puts(const char *s)
{
	serial_puts_dev(ACTING_UART0_BASE, s);
}

int serial_getc(void)
{
	return serial_getc_dev(ACTING_UART0_BASE);
}

int serial_tstc(void)
{
	return serial_tstc_dev(ACTING_UART0_BASE);
}
#endif /* CONFIG_SERIAL_MULTI */

#endif	/* CONFIG_405GP || CONFIG_405CR */