aboutsummaryrefslogtreecommitdiff
path: root/board/egnite/ethernut5/ethernut5_pwrman.c
blob: 4b00038457356db35a3eaa502a2f222bd1c76c9f (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
/*
 * (C) Copyright 2011
 * egnite GmbH <info@egnite.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
 */

/*
 * Ethernut 5 power management support
 *
 * This board may be supplied via USB, IEEE 802.3af PoE or an
 * auxiliary DC input. An on-board ATmega168 microcontroller,
 * the so called power management controller or PMC, is used
 * to select the supply source and to switch on and off certain
 * energy consuming board components. This allows to reduce the
 * total stand-by consumption to less than 70mW.
 *
 * The main CPU communicates with the PMC via I2C. When
 * CONFIG_CMD_BSP is defined in the board configuration file,
 * then the board specific command 'pwrman' becomes available,
 * which allows to manually deal with the PMC.
 *
 * Two distinct registers are provided by the PMC for enabling
 * and disabling specific features. This avoids the often seen
 * read-modify-write cycle or shadow register requirement.
 * Additional registers are available to query the board
 * status and temperature, the auxiliary voltage and to control
 * the green user LED that is integrated in the reset switch.
 *
 * Note, that the AVR firmware of the PMC is released under BSDL.
 *
 * For additional information visit the project home page at
 * http://www.ethernut.de/
 */
#include <common.h>
#include <asm/arch/at91sam9260.h>
#include <asm/arch/at91_common.h>
#include <asm/arch/gpio.h>
#include <asm/io.h>
#include <i2c.h>

#include "ethernut5_pwrman.h"

/* PMC firmware version */
static int pwrman_major;
static int pwrman_minor;

/*
 * Enable Ethernut 5 power management.
 *
 * This function must be called during board initialization.
 * While we are using u-boot's I2C subsystem, it may be required
 * to enable the serial port before calling this function,
 * in particular when debugging is enabled.
 *
 * If board specific commands are not available, we will activate
 * all board components.
 */
void ethernut5_power_init(void)
{
	pwrman_minor = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_VERS);
	pwrman_major = pwrman_minor >> 4;
	pwrman_minor &= 15;

#ifndef CONFIG_CMD_BSP
	/* Do not modify anything, if we do not have a known version. */
	if (pwrman_major == 2) {
		/* Without board specific commands we enable all features. */
		i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA, ~PWRMAN_ETHRST);
		i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_DIS, PWRMAN_ETHRST);
	}
#endif
}

/*
 * Reset Ethernet PHY.
 *
 * This function allows the re-configure the PHY after
 * changing its strap pins.
 */
void ethernut5_phy_reset(void)
{
	/* Do not modify anything, if we do not have a known version. */
	if (pwrman_major != 2)
		return;

	/*
	 * Make sure that the Ethernet clock is enabled and the PHY reset
	 * is disabled for at least 100 us.
	 */
	i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA, PWRMAN_ETHCLK);
	i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_DIS, PWRMAN_ETHRST);
	udelay(100);

	/*
	 * LAN8710 strap pins are
	 * PA14 => PHY MODE0
	 * PA15 => PHY MODE1
	 * PA17 => PHY MODE2 => 111b all capable
	 * PA18 => PHY ADDR0 => 0b
	 */
	at91_set_pio_input(AT91_PIO_PORTA, 14, 1);
	at91_set_pio_input(AT91_PIO_PORTA, 15, 1);
	at91_set_pio_input(AT91_PIO_PORTA, 17, 1);
	at91_set_pio_input(AT91_PIO_PORTA, 18, 0);

	/* Activate PHY reset for 100 us. */
	i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA, PWRMAN_ETHRST);
	udelay(100);
	i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_DIS, PWRMAN_ETHRST);

	at91_set_pio_input(AT91_PIO_PORTA, 14, 1);
}

/*
 * Output the firmware version we got during initialization.
 */
void ethernut5_print_version(void)
{
	printf("%u.%u\n", pwrman_major, pwrman_minor);
}

/*
 * All code below this point is optional and implements
 * the 'pwrman' command.
 */
#ifdef CONFIG_CMD_BSP

/* Human readable names of PMC features */
char *pwrman_feat[8] = {
	"board", "vbin", "vbout", "mmc",
	"rs232", "ethclk", "ethrst", "wakeup"
};

/*
 * Print all feature names, that have its related flags enabled.
 */
static void print_flagged_features(u8 flags)
{
	int i;

	for (i = 0; i < 8; i++) {
		if (flags & (1 << i))
			printf("%s ", pwrman_feat[i]);
	}
}

/*
 * Return flags of a given list of feature names.
 *
 * The function stops at the first unknown list entry and
 * returns the number of detected names as a function result.
 */
static int feature_flags(char * const names[], int num, u8 *flags)
{
	int i, j;

	*flags = 0;
	for (i = 0; i < num; i++) {
		for (j = 0; j < 8; j++) {
			if (strcmp(pwrman_feat[j], names[i]) == 0) {
				*flags |= 1 << j;
				break;
			}
		}
		if (j > 7)
			break;
	}
	return i;
}

void ethernut5_print_power(void)
{
	u8 flags;
	int i;

	flags = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA);
	for (i = 0; i < 2; i++) {
		if (flags) {
			print_flagged_features(flags);
			printf("%s\n", i ? "off" : "on");
		}
		flags = ~flags;
	}
}

void ethernut5_print_celsius(void)
{
	int val;

	/* Read ADC value from LM50 and return Celsius degrees. */
	val = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_TEMP);
	val *= 5000;	/* 100mV/degree with 5V reference */
	val += 128;	/* 8 bit resolution */
	val /= 256;
	val -= 450;	/* Celsius offset, still x10 */
	/* Output full degrees. */
	printf("%d\n", (val + 5) / 10);
}

void ethernut5_print_voltage(void)
{
	int val;

	/* Read ADC value from divider and return voltage. */
	val = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_VAUX);
	/* Resistors are 100k and 12.1k */
	val += 5;
	val *= 180948;
	val /= 100000;
	val++;
	/* Calculation was done in 0.1V units. */
	printf("%d\n", (val + 5) / 10);
}

/*
 * Process the board specific 'pwrman' command.
 */
int do_pwrman(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	u8 val;
	int i;

	if (argc == 1) {
		ethernut5_print_power();
	} else if (argc == 2 && strcmp(argv[1], "reset") == 0) {
		at91_set_pio_output(AT91_PIO_PORTB, 8, 1);
		udelay(100);
		at91_set_pio_output(AT91_PIO_PORTB, 8, 0);
		udelay(100000);
	} else if (argc == 2 && strcmp(argv[1], "temp") == 0) {
		ethernut5_print_celsius();
	} else if (argc == 2 && strcmp(argv[1], "vaux") == 0) {
		ethernut5_print_voltage();
	} else if (argc == 2 && strcmp(argv[1], "version") == 0) {
		ethernut5_print_version();
	} else if (strcmp(argv[1], "led") == 0) {
		/* Control the green status LED. Blink frequency unit
		** is 0.1s, very roughly. */
		if (argc == 2) {
			/* No more arguments, output current settings. */
			val = i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_LEDCTL);
			printf("led %u %u\n", val >> 4, val & 15);
		} else {
			/* First argument specifies the on-time. */
			val = (u8) simple_strtoul(argv[2], NULL, 0);
			val <<= 4;
			if (argc > 3) {
				/* Second argument specifies the off-time. */
				val |= (u8) (simple_strtoul(argv[3], NULL, 0)
						& 15);
			}
			/* Update the LED control register. */
			i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_LEDCTL, val);
		}
	} else {
		/* We expect a list of features followed an optional status. */
		argc--;
		i = feature_flags(&argv[1], argc, &val);
		if (argc == i) {
			/* We got a list only, print status. */
			val &= i2c_reg_read(PWRMAN_I2C_ADDR, PWRMAN_REG_STA);
			if (val) {
				if (i > 1)
					print_flagged_features(val);
				printf("active\n");
			} else {
				printf("inactive\n");
			}
		} else {
			/* More arguments. */
			if (i == 0) {
				/* No given feature, use despensibles. */
				val = PWRMAN_DISPENSIBLE;
			}
			if (strcmp(argv[i + 1], "on") == 0) {
				/* Enable features. */
				i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_ENA,
						val);
			} else if (strcmp(argv[i + 1], "off") == 0) {
				/* Disable features. */
				i2c_reg_write(PWRMAN_I2C_ADDR, PWRMAN_REG_DIS,
						val);
			} else {
				printf("Bad parameter %s\n", argv[i + 1]);
				return 1;
			}
		}
	}
	return 0;
}

U_BOOT_CMD(
	pwrman,	CONFIG_SYS_MAXARGS, 1, do_pwrman,
	"power management",
		   "- print settings\n"
	"pwrman feature ...\n"
	"       - print status\n"
	"pwrman [feature ...] on|off\n"
	"       - enable/disable specified or all dispensible features\n"
	"pwrman led [on-time [off-time]]\n"
	"       - print or set led blink timer\n"
	"pwrman temp\n"
	"       - print board temperature (Celsius)\n"
	"pwrman vaux\n"
	"       - print auxiliary input voltage\n"
	"pwrman reset\n"
	"       - reset power management controller\n"
	"pwrman version\n"
	"       - print firmware version\n"
	"\n"
	"        features, (*)=dispensible:\n"
	"          board  - 1.8V and 3.3V supply\n"
	"          vbin   - supply via USB device connector\n"
	"          vbout  - USB host connector supply(*)\n"
	"          mmc    - MMC slot supply(*)\n"
	"          rs232  - RS232 driver\n"
	"          ethclk - Ethernet PHY clock(*)\n"
	"          ethrst - Ethernet PHY reset\n"
	"          wakeup - RTC alarm"
);
#endif /* CONFIG_CMD_BSP */