aboutsummaryrefslogtreecommitdiff
path: root/plat/meson/gxbb/gxbb_scpi.c
blob: 83eeda29d48dd1c33f89cd6405c3492e50626444 (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
/*
 * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>
#include <string.h>

#include <platform_def.h>

#include <lib/mmio.h>
#include <plat/common/platform.h>

#include "gxbb_private.h"

#define SIZE_SHIFT	20
#define SIZE_MASK	0x1FF

/*
 * Note: The Amlogic SCP firmware uses the legacy SCPI protocol.
 */
#define SCPI_CMD_SET_CSS_POWER_STATE	0x04
#define SCPI_CMD_SET_SYS_POWER_STATE	0x08

#define SCPI_CMD_JTAG_SET_STATE		0xC0
#define SCPI_CMD_EFUSE_READ		0xC2

static inline uint32_t scpi_cmd(uint32_t command, uint32_t size)
{
	return command | (size << SIZE_SHIFT);
}

void scpi_secure_message_send(uint32_t command, uint32_t size)
{
	mhu_secure_message_send(scpi_cmd(command, size));
}

uint32_t scpi_secure_message_receive(void **message_out, size_t *size_out)
{
	uint32_t response = mhu_secure_message_wait();

	size_t size = (response >> SIZE_SHIFT) & SIZE_MASK;

	response &= ~(SIZE_MASK << SIZE_SHIFT);

	if (size_out != NULL)
		*size_out = size;

	if (message_out != NULL)
		*message_out = (void *)GXBB_MHU_SECURE_SCP_TO_AP_PAYLOAD;

	return response;
}

void scpi_set_css_power_state(u_register_t mpidr, uint32_t cpu_state,
			      uint32_t cluster_state, uint32_t css_state)
{
	uint32_t state = (mpidr & 0x0F) | /* CPU ID */
			 ((mpidr & 0xF00) >> 4) | /* Cluster ID */
			 (cpu_state << 8) |
			 (cluster_state << 12) |
			 (css_state << 16);

	mhu_secure_message_start();
	mmio_write_32(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD, state);
	mhu_secure_message_send(scpi_cmd(SCPI_CMD_SET_CSS_POWER_STATE, 4));
	mhu_secure_message_wait();
	mhu_secure_message_end();
}

uint32_t scpi_sys_power_state(uint64_t system_state)
{
	uint32_t *response;
	size_t size;

	mhu_secure_message_start();
	mmio_write_8(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD, system_state);
	mhu_secure_message_send(scpi_cmd(SCPI_CMD_SET_SYS_POWER_STATE, 1));
	scpi_secure_message_receive((void *)&response, &size);
	mhu_secure_message_end();

	return *response;
}

void scpi_jtag_set_state(uint32_t state, uint8_t select)
{
	assert(state <= GXBB_JTAG_STATE_OFF);

	if (select > GXBB_JTAG_A53_EE) {
		WARN("BL31: Invalid JTAG select (0x%x).\n", select);
		return;
	}

	mhu_secure_message_start();
	mmio_write_32(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD,
		      (state << 8) | (uint32_t)select);
	mhu_secure_message_send(scpi_cmd(SCPI_CMD_JTAG_SET_STATE, 4));
	mhu_secure_message_wait();
	mhu_secure_message_end();
}

uint32_t scpi_efuse_read(void *dst, uint32_t base, uint32_t size)
{
	uint32_t *response;
	size_t resp_size;

	if (size > 0x1FC)
		return 0;

	mhu_secure_message_start();
	mmio_write_32(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD, base);
	mmio_write_32(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD + 4, size);
	mhu_secure_message_send(scpi_cmd(SCPI_CMD_EFUSE_READ, 8));
	scpi_secure_message_receive((void *)&response, &resp_size);
	mhu_secure_message_end();

	/*
	 * response[0] is the size of the response message.
	 * response[1 ... N] are the contents.
	 */
	if (*response != 0)
		memcpy(dst, response + 1, *response);

	return *response;
}

void scpi_unknown_thermal(uint32_t arg0, uint32_t arg1,
			  uint32_t arg2, uint32_t arg3)
{
	mhu_secure_message_start();
	mmio_write_32(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD + 0x0, arg0);
	mmio_write_32(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD + 0x4, arg1);
	mmio_write_32(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD + 0x8, arg2);
	mmio_write_32(GXBB_MHU_SECURE_AP_TO_SCP_PAYLOAD + 0xC, arg3);
	mhu_secure_message_send(scpi_cmd(0xC3, 16));
	mhu_secure_message_wait();
	mhu_secure_message_end();
}