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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <device/mmio.h>
#include <timer.h>
#include <amdblocks/psp.h>
#include <soc/iomap.h>
#include "psp_def.h"
#define PSP_MAILBOX_OFFSET 0x10570
static uintptr_t soc_get_psp_base_address(void)
{
uintptr_t psp_mmio = rdmsr(MSR_PSP_ADDR).lo;
if (!psp_mmio)
printk(BIOS_ERR, "PSP: MSR_PSP_ADDR uninitialized\n");
return psp_mmio;
}
void *soc_get_mbox_address(void)
{
uintptr_t psp_mmio = soc_get_psp_base_address();
if (!psp_mmio)
return 0;
return (void *)(psp_mmio + PSP_MAILBOX_OFFSET);
}
static u16 rd_mbox_sts(struct pspv2_mbox *mbox)
{
union {
u32 val;
struct pspv2_mbox_cmd_fields fields;
} tmp = { 0 };
tmp.val = read32(&mbox->val);
return tmp.fields.mbox_status;
}
static void wr_mbox_cmd(struct pspv2_mbox *mbox, u8 cmd)
{
union {
u32 val;
struct pspv2_mbox_cmd_fields fields;
} tmp = { 0 };
/* Write entire 32-bit area to begin command execution */
tmp.fields.mbox_command = cmd;
write32(&mbox->val, tmp.val);
}
static u8 rd_mbox_recovery(struct pspv2_mbox *mbox)
{
union {
u32 val;
struct pspv2_mbox_cmd_fields fields;
} tmp = { 0 };
tmp.val = read32(&mbox->val);
return !!tmp.fields.recovery;
}
static void wr_mbox_cmd_resp(struct pspv2_mbox *mbox, void *buffer)
{
write64(&mbox->cmd_response, (uintptr_t)buffer);
}
static int wait_command(struct pspv2_mbox *mbox, bool wait_for_ready)
{
struct pspv2_mbox and_mask = { .val = ~0 };
struct pspv2_mbox expected = { .val = 0 };
struct stopwatch sw;
u32 tmp;
/* Zero fields from and_mask that should be kept */
and_mask.fields.mbox_command = 0;
and_mask.fields.ready = wait_for_ready ? 0 : 1;
/* Expect mbox_cmd == 0 but ready depends */
if (wait_for_ready)
expected.fields.ready = 1;
stopwatch_init_msecs_expire(&sw, PSP_CMD_TIMEOUT);
do {
tmp = read32(&mbox->val);
tmp &= ~and_mask.val;
if (tmp == expected.val)
return 0;
} while (!stopwatch_expired(&sw));
return -PSPSTS_CMD_TIMEOUT;
}
int send_psp_command(u32 command, void *buffer)
{
struct pspv2_mbox *mbox = soc_get_mbox_address();
if (!mbox)
return -PSPSTS_NOBASE;
if (rd_mbox_recovery(mbox))
return -PSPSTS_RECOVERY;
if (wait_command(mbox, true))
return -PSPSTS_CMD_TIMEOUT;
/* set address of command-response buffer and write command register */
wr_mbox_cmd_resp(mbox, buffer);
wr_mbox_cmd(mbox, command);
/* PSP clears command register when complete. All commands except
* SxInfo set the Ready bit. */
if (wait_command(mbox, command != MBOX_BIOS_CMD_SX_INFO))
return -PSPSTS_CMD_TIMEOUT;
/* check delivery status */
if (rd_mbox_sts(mbox))
return -PSPSTS_SEND_ERROR;
return 0;
}
|
