summaryrefslogtreecommitdiff
path: root/arch/powerpc/cpu/mpc512x/serial.c
blob: 4105a28509143d48f402ee7c2b43eb089b473c50 (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
/*
 * (C) Copyright 2000 - 2010
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 *
 * Based ont the MPC5200 PSC driver.
 * Adapted for MPC512x by Jan Wrobel <wrr@semihalf.com>
 */

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

#include <common.h>
#include <linux/compiler.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <serial.h>

DECLARE_GLOBAL_DATA_PTR;

#if defined(CONFIG_PSC_CONSOLE)

static void fifo_init (volatile psc512x_t *psc)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	u32 tfsize, rfsize;

	/* reset Rx & Tx fifo slice */
	out_be32(&psc->rfcmd, PSC_FIFO_RESET_SLICE);
	out_be32(&psc->tfcmd, PSC_FIFO_RESET_SLICE);

	/* disable Tx & Rx FIFO interrupts */
	out_be32(&psc->rfintmask, 0);
	out_be32(&psc->tfintmask, 0);

	switch (((u32)psc & 0xf00) >> 8) {
	case 0:
		tfsize = FIFOC_PSC0_TX_SIZE | (FIFOC_PSC0_TX_ADDR << 16);
		rfsize = FIFOC_PSC0_RX_SIZE | (FIFOC_PSC0_RX_ADDR << 16);
		break;
	case 1:
		tfsize = FIFOC_PSC1_TX_SIZE | (FIFOC_PSC1_TX_ADDR << 16);
		rfsize = FIFOC_PSC1_RX_SIZE | (FIFOC_PSC1_RX_ADDR << 16);
		break;
	case 2:
		tfsize = FIFOC_PSC2_TX_SIZE | (FIFOC_PSC2_TX_ADDR << 16);
		rfsize = FIFOC_PSC2_RX_SIZE | (FIFOC_PSC2_RX_ADDR << 16);
		break;
	case 3:
		tfsize = FIFOC_PSC3_TX_SIZE | (FIFOC_PSC3_TX_ADDR << 16);
		rfsize = FIFOC_PSC3_RX_SIZE | (FIFOC_PSC3_RX_ADDR << 16);
		break;
	case 4:
		tfsize = FIFOC_PSC4_TX_SIZE | (FIFOC_PSC4_TX_ADDR << 16);
		rfsize = FIFOC_PSC4_RX_SIZE | (FIFOC_PSC4_RX_ADDR << 16);
		break;
	case 5:
		tfsize = FIFOC_PSC5_TX_SIZE | (FIFOC_PSC5_TX_ADDR << 16);
		rfsize = FIFOC_PSC5_RX_SIZE | (FIFOC_PSC5_RX_ADDR << 16);
		break;
	case 6:
		tfsize = FIFOC_PSC6_TX_SIZE | (FIFOC_PSC6_TX_ADDR << 16);
		rfsize = FIFOC_PSC6_RX_SIZE | (FIFOC_PSC6_RX_ADDR << 16);
		break;
	case 7:
		tfsize = FIFOC_PSC7_TX_SIZE | (FIFOC_PSC7_TX_ADDR << 16);
		rfsize = FIFOC_PSC7_RX_SIZE | (FIFOC_PSC7_RX_ADDR << 16);
		break;
	case 8:
		tfsize = FIFOC_PSC8_TX_SIZE | (FIFOC_PSC8_TX_ADDR << 16);
		rfsize = FIFOC_PSC8_RX_SIZE | (FIFOC_PSC8_RX_ADDR << 16);
		break;
	case 9:
		tfsize = FIFOC_PSC9_TX_SIZE | (FIFOC_PSC9_TX_ADDR << 16);
		rfsize = FIFOC_PSC9_RX_SIZE | (FIFOC_PSC9_RX_ADDR << 16);
		break;
	case 10:
		tfsize = FIFOC_PSC10_TX_SIZE | (FIFOC_PSC10_TX_ADDR << 16);
		rfsize = FIFOC_PSC10_RX_SIZE | (FIFOC_PSC10_RX_ADDR << 16);
		break;
	case 11:
		tfsize = FIFOC_PSC11_TX_SIZE | (FIFOC_PSC11_TX_ADDR << 16);
		rfsize = FIFOC_PSC11_RX_SIZE | (FIFOC_PSC11_RX_ADDR << 16);
		break;
	default:
		return;
	}

	out_be32(&psc->tfsize, tfsize);
	out_be32(&psc->rfsize, rfsize);

	/* enable Tx & Rx FIFO slice */
	out_be32(&psc->rfcmd, PSC_FIFO_ENABLE_SLICE);
	out_be32(&psc->tfcmd, PSC_FIFO_ENABLE_SLICE);

	out_be32(&im->fifoc.fifoc_cmd, FIFOC_DISABLE_CLOCK_GATE);
	__asm__ volatile ("sync");
}

void serial_setbrg_dev(unsigned int idx)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
	unsigned long baseclk, div;
	unsigned long baudrate;
	char buf[16];
	char *br_env;

	baudrate = gd->baudrate;
	if (idx != CONFIG_PSC_CONSOLE) {
		/* Allows setting baudrate for other serial devices
		 * on PSCx using environment. If not specified, use
		 * the same baudrate as for console.
		 */
		sprintf(buf, "psc%d_baudrate", idx);
		br_env = getenv(buf);
		if (br_env)
			baudrate = simple_strtoul(br_env, NULL, 10);

		debug("%s: idx %d, baudrate %ld\n", __func__, idx, baudrate);
	}

	/* calculate divisor for setting PSC CTUR and CTLR registers */
	baseclk = (gd->arch.ips_clk + 8) / 16;
	div = (baseclk + (baudrate / 2)) / baudrate;

	out_8(&psc->ctur, (div >> 8) & 0xff);
	out_8(&psc->ctlr,  div & 0xff); /* set baudrate */
}

int serial_init_dev(unsigned int idx)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
	u32 reg;

	reg = in_be32(&im->clk.sccr[0]);
	out_be32(&im->clk.sccr[0], reg | CLOCK_SCCR1_PSC_EN(idx));

	fifo_init (psc);

	/* set MR register to point to MR1 */
	out_8(&psc->command, PSC_SEL_MODE_REG_1);

	/* disable Tx/Rx */
	out_8(&psc->command, PSC_TX_DISABLE | PSC_RX_DISABLE);

	/* choose the prescaler	by 16 for the Tx/Rx clock generation */
	out_be16(&psc->psc_clock_select, 0xdd00);

	/* switch to UART mode */
	out_be32(&psc->sicr, 0);

	/* mode register points to mr1 */
	/* configure parity, bit length and so on in mode register 1*/
	out_8(&psc->mode, PSC_MODE_8_BITS | PSC_MODE_PARNONE);
	/* now, mode register points to mr2 */
	out_8(&psc->mode, PSC_MODE_1_STOPBIT);

	/* set baudrate */
	serial_setbrg_dev(idx);

	/* disable all interrupts */
	out_be16(&psc->psc_imr, 0);

	/* reset and enable Rx/Tx */
	out_8(&psc->command, PSC_RST_RX);
	out_8(&psc->command, PSC_RST_TX);
	out_8(&psc->command, PSC_RX_ENABLE | PSC_TX_ENABLE);

	return 0;
}

int serial_uninit_dev(unsigned int idx)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];
	u32 reg;

	out_8(&psc->command, PSC_RX_DISABLE | PSC_TX_DISABLE);
	reg = in_be32(&im->clk.sccr[0]);
	reg &= ~CLOCK_SCCR1_PSC_EN(idx);
	out_be32(&im->clk.sccr[0], reg);

	return 0;
}

void serial_putc_dev(unsigned int idx, const char c)
{
	volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];

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

	/* Wait for last character to go. */
	while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
		;

	out_8(&psc->tfdata_8, c);
}

void serial_putc_raw_dev(unsigned int idx, const char c)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];

	/* Wait for last character to go. */
	while (!(in_be16(&psc->psc_status) & PSC_SR_TXEMP))
		;

	out_8(&psc->tfdata_8, c);
}

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

int serial_getc_dev(unsigned int idx)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];

	/* Wait for a character to arrive. */
	while (in_be32(&psc->rfstat) & PSC_FIFO_EMPTY)
		;

	return in_8(&psc->rfdata_8);
}

int serial_tstc_dev(unsigned int idx)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];

	return !(in_be32(&psc->rfstat) & PSC_FIFO_EMPTY);
}

void serial_setrts_dev(unsigned int idx, int s)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];

	if (s) {
		/* Assert RTS (become LOW) */
		out_8(&psc->op1, 0x1);
	}
	else {
		/* Negate RTS (become HIGH) */
		out_8(&psc->op0, 0x1);
	}
}

int serial_getcts_dev(unsigned int idx)
{
	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
	volatile psc512x_t *psc = (psc512x_t *) &im->psc[idx];

	return (in_8(&psc->ip) & 0x1) ? 0 : 1;
}
#endif /* CONFIG_PSC_CONSOLE */

#define DECLARE_PSC_SERIAL_FUNCTIONS(port) \
	int serial##port##_init(void) \
	{ \
		return serial_init_dev(port); \
	} \
	int serial##port##_uninit(void) \
	{ \
		return serial_uninit_dev(port); \
	} \
	void serial##port##_setbrg(void) \
	{ \
		serial_setbrg_dev(port); \
	} \
	int serial##port##_getc(void) \
	{ \
		return serial_getc_dev(port); \
	} \
	int serial##port##_tstc(void) \
	{ \
		return serial_tstc_dev(port); \
	} \
	void serial##port##_putc(const char c) \
	{ \
		serial_putc_dev(port, c); \
	} \
	void serial##port##_puts(const char *s) \
	{ \
		serial_puts_dev(port, s); \
	}

#define INIT_PSC_SERIAL_STRUCTURE(port, __name) {	\
	.name	= __name,				\
	.start	= serial##port##_init,			\
	.stop	= serial##port##_uninit,		\
	.setbrg	= serial##port##_setbrg,		\
	.getc	= serial##port##_getc,			\
	.tstc	= serial##port##_tstc,			\
	.putc	= serial##port##_putc,			\
	.puts	= serial##port##_puts,			\
}

#if defined(CONFIG_SYS_PSC1)
DECLARE_PSC_SERIAL_FUNCTIONS(1);
struct serial_device serial1_device =
INIT_PSC_SERIAL_STRUCTURE(1, "psc1");
#endif

#if defined(CONFIG_SYS_PSC3)
DECLARE_PSC_SERIAL_FUNCTIONS(3);
struct serial_device serial3_device =
INIT_PSC_SERIAL_STRUCTURE(3, "psc3");
#endif

#if defined(CONFIG_SYS_PSC4)
DECLARE_PSC_SERIAL_FUNCTIONS(4);
struct serial_device serial4_device =
INIT_PSC_SERIAL_STRUCTURE(4, "psc4");
#endif

#if defined(CONFIG_SYS_PSC6)
DECLARE_PSC_SERIAL_FUNCTIONS(6);
struct serial_device serial6_device =
INIT_PSC_SERIAL_STRUCTURE(6, "psc6");
#endif

__weak struct serial_device *default_serial_console(void)
{
#if (CONFIG_PSC_CONSOLE == 3)
	return &serial3_device;
#elif (CONFIG_PSC_CONSOLE == 6)
	return &serial6_device;
#else
#error "invalid CONFIG_PSC_CONSOLE"
#endif
}

void mpc512x_serial_initialize(void)
{
#if defined(CONFIG_SYS_PSC1)
	serial_register(&serial1_device);
#endif
#if defined(CONFIG_SYS_PSC3)
	serial_register(&serial3_device);
#endif
#if defined(CONFIG_SYS_PSC4)
	serial_register(&serial4_device);
#endif
#if defined(CONFIG_SYS_PSC6)
	serial_register(&serial6_device);
#endif
}

#include <stdio_dev.h>
/*
 * Routines for communication with serial devices over PSC
 */
/* Bitfield for initialized PSCs */
static unsigned int initialized;

struct stdio_dev *open_port(int num, int baudrate)
{
	struct stdio_dev *port;
	char env_var[16];
	char env_val[10];
	char name[7];

	if (num < 0 || num > 11)
		return NULL;

	sprintf(name, "psc%d", num);
	port = stdio_get_by_name(name);
	if (!port)
		return NULL;

	if (!test_bit(num, &initialized)) {
		sprintf(env_var, "psc%d_baudrate", num);
		sprintf(env_val, "%d", baudrate);
		setenv(env_var, env_val);

		if (port->start(port))
			return NULL;

		set_bit(num, &initialized);
	}

	return port;
}

int close_port(int num)
{
	struct stdio_dev *port;
	int ret;
	char name[7];

	if (num < 0 || num > 11)
		return -1;

	sprintf(name, "psc%d", num);
	port = stdio_get_by_name(name);
	if (!port)
		return -1;

	ret = port->stop(port);
	clear_bit(num, &initialized);

	return ret;
}

int write_port(struct stdio_dev *port, char *buf)
{
	if (!port || !buf)
		return -1;

	port->puts(port, buf);

	return 0;
}

int read_port(struct stdio_dev *port, char *buf, int size)
{
	int cnt = 0;

	if (!port || !buf)
		return -1;

	if (!size)
		return 0;

	while (port->tstc(port)) {
		buf[cnt++] = port->getc(port);
		if (cnt > size)
			break;
	}

	return cnt;
}