aboutsummaryrefslogtreecommitdiff
path: root/examples/standalone/smc911x_eeprom.c
blob: c51a05028a5e09ed03657fae9696000d55991c16 (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
/*
 * smc911x_eeprom.c - EEPROM interface to SMC911x parts.
 * Only tested on SMSC9118 though ...
 *
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 *
 * Based on smc91111_eeprom.c which:
 * Heavily borrowed from the following peoples GPL'ed software:
 *  - Wolfgang Denk, DENX Software Engineering, wd@denx.de
 *       Das U-boot
 *  - Ladislav Michl ladis@linux-mips.org
 *       A rejected patch on the U-Boot mailing list
 */

#include <common.h>
#include <exports.h>
#include "../drivers/net/smc911x.h"

/**
 *	smsc_ctrlc - detect press of CTRL+C (common ctrlc() isnt exported!?)
 */
static int smsc_ctrlc(void)
{
	return (tstc() && getc() == 0x03);
}

/**
 *	usage - dump usage information
 */
static void usage(void)
{
	puts(
		"MAC/EEPROM Commands:\n"
		" P : Print the MAC addresses\n"
		" D : Dump the EEPROM contents\n"
		" M : Dump the MAC contents\n"
		" C : Copy the MAC address from the EEPROM to the MAC\n"
		" W : Write a register in the EEPROM or in the MAC\n"
		" Q : Quit\n"
		"\n"
		"Some commands take arguments:\n"
		" W <E|M> <register> <value>\n"
		"    E: EEPROM   M: MAC\n"
	);
}

/**
 *	dump_regs - dump the MAC registers
 *
 * Registers 0x00 - 0x50 are FIFOs.  The 0x50+ are the control registers
 * and they're all 32bits long.  0xB8+ are reserved, so don't bother.
 */
static void dump_regs(struct eth_device *dev)
{
	u8 i, j = 0;
	for (i = 0x50; i < 0xB8; i += sizeof(u32))
		printf("%02x: 0x%08x %c", i,
			smc911x_reg_read(dev, i),
			(j++ % 2 ? '\n' : ' '));
}

/**
 *	do_eeprom_cmd - handle eeprom communication
 */
static int do_eeprom_cmd(struct eth_device *dev, int cmd, u8 reg)
{
	if (smc911x_reg_read(dev, E2P_CMD) & E2P_CMD_EPC_BUSY) {
		printf("eeprom_cmd: busy at start (E2P_CMD = 0x%08x)\n",
			smc911x_reg_read(dev, E2P_CMD));
		return -1;
	}

	smc911x_reg_write(dev, E2P_CMD, E2P_CMD_EPC_BUSY | cmd | reg);

	while (smc911x_reg_read(dev, E2P_CMD) & E2P_CMD_EPC_BUSY)
		if (smsc_ctrlc()) {
			printf("eeprom_cmd: timeout (E2P_CMD = 0x%08x)\n",
				smc911x_reg_read(dev, E2P_CMD));
			return -1;
		}

	return 0;
}

/**
 *	read_eeprom_reg - read specified register in EEPROM
 */
static u8 read_eeprom_reg(struct eth_device *dev, u8 reg)
{
	int ret = do_eeprom_cmd(dev, E2P_CMD_EPC_CMD_READ, reg);
	return (ret ? : smc911x_reg_read(dev, E2P_DATA));
}

/**
 *	write_eeprom_reg - write specified value into specified register in EEPROM
 */
static int write_eeprom_reg(struct eth_device *dev, u8 value, u8 reg)
{
	int ret;

	/* enable erasing/writing */
	ret = do_eeprom_cmd(dev, E2P_CMD_EPC_CMD_EWEN, reg);
	if (ret)
		goto done;

	/* erase the eeprom reg */
	ret = do_eeprom_cmd(dev, E2P_CMD_EPC_CMD_ERASE, reg);
	if (ret)
		goto done;

	/* write the eeprom reg */
	smc911x_reg_write(dev, E2P_DATA, value);
	ret = do_eeprom_cmd(dev, E2P_CMD_EPC_CMD_WRITE, reg);
	if (ret)
		goto done;

	/* disable erasing/writing */
	ret = do_eeprom_cmd(dev, E2P_CMD_EPC_CMD_EWDS, reg);

 done:
	return ret;
}

/**
 *	skip_space - find first non-whitespace in given pointer
 */
static char *skip_space(char *buf)
{
	while (buf[0] == ' ' || buf[0] == '\t')
		++buf;
	return buf;
}

/**
 *	write_stuff - handle writing of MAC registers / eeprom
 */
static void write_stuff(struct eth_device *dev, char *line)
{
	char dest;
	char *endp;
	u8 reg;
	u32 value;

	/* Skip over the "W " part of the command */
	line = skip_space(line + 1);

	/* Figure out destination */
	switch (line[0]) {
	case 'E':
	case 'M':
		dest = line[0];
		break;
	default:
	invalid_usage:
		printf("ERROR: Invalid write usage\n");
		usage();
		return;
	}

	/* Get the register to write */
	line = skip_space(line + 1);
	reg = simple_strtoul(line, &endp, 16);
	if (line == endp)
		goto invalid_usage;

	/* Get the value to write */
	line = skip_space(endp);
	value = simple_strtoul(line, &endp, 16);
	if (line == endp)
		goto invalid_usage;

	/* Check for trailing cruft */
	line = skip_space(endp);
	if (line[0])
		goto invalid_usage;

	/* Finally, execute the command */
	if (dest == 'E') {
		printf("Writing EEPROM register %02x with %02x\n", reg, value);
		write_eeprom_reg(dev, value, reg);
	} else {
		printf("Writing MAC register %02x with %08x\n", reg, value);
		smc911x_reg_write(dev, reg, value);
	}
}

/**
 *	copy_from_eeprom - copy MAC address in eeprom to address registers
 */
static void copy_from_eeprom(struct eth_device *dev)
{
	ulong addrl =
		read_eeprom_reg(dev, 0x01) |
		read_eeprom_reg(dev, 0x02) << 8 |
		read_eeprom_reg(dev, 0x03) << 16 |
		read_eeprom_reg(dev, 0x04) << 24;
	ulong addrh =
		read_eeprom_reg(dev, 0x05) |
		read_eeprom_reg(dev, 0x06) << 8;
	smc911x_set_mac_csr(dev, ADDRL, addrl);
	smc911x_set_mac_csr(dev, ADDRH, addrh);
	puts("EEPROM contents copied to MAC\n");
}

/**
 *	print_macaddr - print MAC address registers and MAC address in eeprom
 */
static void print_macaddr(struct eth_device *dev)
{
	puts("Current MAC Address in MAC:     ");
	ulong addrl = smc911x_get_mac_csr(dev, ADDRL);
	ulong addrh = smc911x_get_mac_csr(dev, ADDRH);
	printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
		(u8)(addrl), (u8)(addrl >> 8), (u8)(addrl >> 16),
		(u8)(addrl >> 24), (u8)(addrh), (u8)(addrh >> 8));

	puts("Current MAC Address in EEPROM:  ");
	int i;
	for (i = 1; i < 6; ++i)
		printf("%02x:", read_eeprom_reg(dev, i));
	printf("%02x\n", read_eeprom_reg(dev, i));
}

/**
 *	dump_eeprom - dump the whole content of the EEPROM
 */
static void dump_eeprom(struct eth_device *dev)
{
	int i;
	puts("EEPROM:\n");
	for (i = 0; i < 7; ++i)
		printf("%02x: 0x%02x\n", i, read_eeprom_reg(dev, i));
}

/**
 *	smc911x_init - get the MAC/EEPROM up and ready for use
 */
static int smc911x_init(struct eth_device *dev)
{
	/* See if there is anything there */
	if (!smc911x_detect_chip(dev))
		return 1;

	smc911x_reset(dev);

	/* Make sure we set EEDIO/EECLK to the EEPROM */
	if (smc911x_reg_read(dev, GPIO_CFG) & GPIO_CFG_EEPR_EN) {
		while (smc911x_reg_read(dev, E2P_CMD) & E2P_CMD_EPC_BUSY)
			if (smsc_ctrlc()) {
				printf("init: timeout (E2P_CMD = 0x%08x)\n",
					smc911x_reg_read(dev, E2P_CMD));
				return 1;
			}
		smc911x_reg_write(dev, GPIO_CFG,
			smc911x_reg_read(dev, GPIO_CFG) & ~GPIO_CFG_EEPR_EN);
	}

	return 0;
}

/**
 *	getline - consume a line of input and handle some escape sequences
 */
static char *getline(void)
{
	static char buffer[100];
	char c;
	size_t i;

	i = 0;
	while (1) {
		buffer[i] = '\0';
		while (!tstc())
			continue;

		c = getc();
		/* Convert to uppercase */
		if (c >= 'a' && c <= 'z')
			c -= ('a' - 'A');

		switch (c) {
		case '\r':	/* Enter/Return key */
		case '\n':
			puts("\n");
			return buffer;

		case 0x03:	/* ^C - break */
			return NULL;

		case 0x5F:
		case 0x08:	/* ^H  - backspace */
		case 0x7F:	/* DEL - backspace */
			if (i) {
				puts("\b \b");
				i--;
			}
			break;

		default:
			/* Ignore control characters */
			if (c < 0x20)
				break;
			/* Queue up all other characters */
			buffer[i++] = c;
			printf("%c", c);
			break;
		}
	}
}

/**
 *	smc911x_eeprom - our application's main() function
 */
int smc911x_eeprom(int argc, char * const argv[])
{
	/* Avoid initializing on stack as gcc likes to call memset() */
	struct eth_device dev;
	dev.iobase = CONFIG_SMC911X_BASE;

	/* Print the ABI version */
	app_startup(argv);
	if (XF_VERSION != get_version()) {
		printf("Expects ABI version %d\n", XF_VERSION);
		printf("Actual U-Boot ABI version %lu\n", get_version());
		printf("Can't run\n\n");
		return 1;
	}

	/* Initialize the MAC/EEPROM somewhat */
	puts("\n");
	if (smc911x_init(&dev))
		return 1;

	/* Dump helpful usage information */
	puts("\n");
	usage();
	puts("\n");

	while (1) {
		char *line;

		/* Send the prompt and wait for a line */
		puts("eeprom> ");
		line = getline();

		/* Got a ctrl+c */
		if (!line)
			return 0;

		/* Eat leading space */
		line = skip_space(line);

		/* Empty line, try again */
		if (!line[0])
			continue;

		/* Only accept 1 letter commands */
		if (line[0] && line[1] && line[1] != ' ' && line[1] != '\t')
			goto unknown_cmd;

		/* Now parse the command */
		switch (line[0]) {
		case 'W': write_stuff(&dev, line); break;
		case 'D': dump_eeprom(&dev);       break;
		case 'M': dump_regs(&dev);         break;
		case 'C': copy_from_eeprom(&dev);  break;
		case 'P': print_macaddr(&dev);     break;
		unknown_cmd:
		default:  puts("ERROR: Unknown command!\n\n");
		case '?':
		case 'H': usage();            break;
		case 'Q': return 0;
		}
	}
}