summaryrefslogtreecommitdiff
path: root/src/soc/nvidia/tegra210/power.c
blob: 51928aec22d89dc616ae5a29e25ce4d581798cb3 (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
/*
 * This file is part of the coreboot project.
 *
 * Copyright 2013 Google Inc.
 * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
 *
 * 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; version 2 of the License.
 *
 * 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.
 */

#include <device/mmio.h>
#include <assert.h>
#include <console/console.h>
#include <soc/addressmap.h>
#include <soc/pmc.h>
#include <soc/power.h>

static struct tegra_pmc_regs * const pmc = (void *)TEGRA_PMC_BASE;

enum {
	POWER_GATE = 0,
	POWER_UNGATE = 1,
};

static int partition_powered(int id)
{
	if (read32(&pmc->pwrgate_status) & (0x1 << id))
		return POWER_UNGATE;

	return POWER_GATE;
}

static const char *const power_gate_string[] = {
	[POWER_GATE] = "Gat",
	[POWER_UNGATE] = "Ungat",
};

static void power_gate_toggle_request(uint32_t id, int request)
{
	printk(BIOS_INFO, "%sing power partition %d.\n",
	       power_gate_string[request], id);

	int part_powered = partition_powered(id);

	if (request == part_powered) {
		printk(BIOS_INFO, "Partition %d already %sed.\n", id,
		       power_gate_string[request]);
		return;
	}

	uint32_t pwrgate_toggle = read32(&pmc->pwrgate_toggle);
	pwrgate_toggle &= ~(PMC_PWRGATE_TOGGLE_PARTID_MASK);
	pwrgate_toggle |= (id << PMC_PWRGATE_TOGGLE_PARTID_SHIFT);
	pwrgate_toggle |= PMC_PWRGATE_TOGGLE_START;
	write32(&pmc->pwrgate_toggle, pwrgate_toggle);

	// Wait for the request to be accepted.
	while (read32(&pmc->pwrgate_toggle) & PMC_PWRGATE_TOGGLE_START)
		;
	printk(BIOS_INFO, "Power gate toggle request accepted.\n");

	while (1) {
		part_powered = partition_powered(id);
		if (request == part_powered) {
			printk(BIOS_INFO, "Partition %d %sed.\n", id,
			       power_gate_string[request]);
			return;
		}
	}
}

void power_gate_partition(uint32_t id)
{
	power_gate_toggle_request(id, POWER_GATE);
}

void power_ungate_partition(uint32_t id)
{
	power_gate_toggle_request(id, POWER_UNGATE);
}

uint8_t pmc_rst_status(void)
{
	return read32(&pmc->rst_status) & PMC_RST_STATUS_SOURCE_MASK;
}

static const char *pmc_rst_status_str[PMC_RST_STATUS_NUM_SOURCES] = {
	[PMC_RST_STATUS_SOURCE_POR] = "POR",
	[PMC_RST_STATUS_SOURCE_WATCHDOG] = "Watchdog",
	[PMC_RST_STATUS_SOURCE_SENSOR] = "Sensor",
	[PMC_RST_STATUS_SOURCE_SW_MAIN] = "SW Main",
	[PMC_RST_STATUS_SOURCE_LP0] = "LP0",
};

void pmc_print_rst_status(void)
{
	uint8_t rst_status = pmc_rst_status();
	assert(rst_status < PMC_RST_STATUS_NUM_SOURCES);
	printk(BIOS_INFO, "PMC Reset Status: %s\n",
	       pmc_rst_status_str[rst_status]);
}

static int partition_clamp_on(int id)
{
	return read32(&pmc->clamp_status) & (1 << id);
}

void remove_clamps(int id)
{
	if (!partition_clamp_on(id))
		return;

	/* Remove clamp */
	write32(&pmc->remove_clamping_cmd, (1 << id));

	/* Wait for clamp off */
	while (partition_clamp_on(id))
		;
}

void pmc_override_pwr_det(uint32_t bits, uint32_t override)
{
	uint32_t val = read32(&pmc->pwr_det_val);
	val &= ~bits;
	val |= (override & bits);
	write32(&pmc->pwr_det_val, val);
}