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
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Intel OnChip System Fabric MailBox access support
*/
#ifndef IOSF_MBI_SYMS_H
#define IOSF_MBI_SYMS_H
#include <linux/notifier.h>
#define MBI_MCR_OFFSET 0xD0
#define MBI_MDR_OFFSET 0xD4
#define MBI_MCRX_OFFSET 0xD8
#define MBI_RD_MASK 0xFEFFFFFF
#define MBI_WR_MASK 0X01000000
#define MBI_MASK_HI 0xFFFFFF00
#define MBI_MASK_LO 0x000000FF
#define MBI_ENABLE 0xF0
/* IOSF SB read/write opcodes */
#define MBI_MMIO_READ 0x00
#define MBI_MMIO_WRITE 0x01
#define MBI_CFG_READ 0x04
#define MBI_CFG_WRITE 0x05
#define MBI_CR_READ 0x06
#define MBI_CR_WRITE 0x07
#define MBI_REG_READ 0x10
#define MBI_REG_WRITE 0x11
#define MBI_ESRAM_READ 0x12
#define MBI_ESRAM_WRITE 0x13
/* Baytrail available units */
#define BT_MBI_UNIT_AUNIT 0x00
#define BT_MBI_UNIT_SMC 0x01
#define BT_MBI_UNIT_CPU 0x02
#define BT_MBI_UNIT_BUNIT 0x03
#define BT_MBI_UNIT_PMC 0x04
#define BT_MBI_UNIT_GFX 0x06
#define BT_MBI_UNIT_SMI 0x0C
#define BT_MBI_UNIT_USB 0x43
#define BT_MBI_UNIT_SATA 0xA3
#define BT_MBI_UNIT_PCIE 0xA6
/* Quark available units */
#define QRK_MBI_UNIT_HBA 0x00
#define QRK_MBI_UNIT_HB 0x03
#define QRK_MBI_UNIT_RMU 0x04
#define QRK_MBI_UNIT_MM 0x05
#define QRK_MBI_UNIT_SOC 0x31
/* Action values for the pmic_bus_access_notifier functions */
#define MBI_PMIC_BUS_ACCESS_BEGIN 1
#define MBI_PMIC_BUS_ACCESS_END 2
#if IS_ENABLED(CONFIG_IOSF_MBI)
bool iosf_mbi_available(void);
/**
* iosf_mbi_read() - MailBox Interface read command
* @port: port indicating subunit being accessed
* @opcode: port specific read or write opcode
* @offset: register address offset
* @mdr: register data to be read
*
* Locking is handled by spinlock - cannot sleep.
* Return: Nonzero on error
*/
int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr);
/**
* iosf_mbi_write() - MailBox unmasked write command
* @port: port indicating subunit being accessed
* @opcode: port specific read or write opcode
* @offset: register address offset
* @mdr: register data to be written
*
* Locking is handled by spinlock - cannot sleep.
* Return: Nonzero on error
*/
int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr);
/**
* iosf_mbi_modify() - MailBox masked write command
* @port: port indicating subunit being accessed
* @opcode: port specific read or write opcode
* @offset: register address offset
* @mdr: register data being modified
* @mask: mask indicating bits in mdr to be modified
*
* Locking is handled by spinlock - cannot sleep.
* Return: Nonzero on error
*/
int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask);
/**
* iosf_mbi_punit_acquire() - Acquire access to the P-Unit
*
* One some systems the P-Unit accesses the PMIC to change various voltages
* through the same bus as other kernel drivers use for e.g. battery monitoring.
*
* If a driver sends requests to the P-Unit which require the P-Unit to access
* the PMIC bus while another driver is also accessing the PMIC bus various bad
* things happen.
*
* To avoid these problems this function must be called before accessing the
* P-Unit or the PMIC, be it through iosf_mbi* functions or through other means.
*
* Note on these systems the i2c-bus driver will request a sempahore from the
* P-Unit for exclusive access to the PMIC bus when i2c drivers are accessing
* it, but this does not appear to be sufficient, we still need to avoid making
* certain P-Unit requests during the access window to avoid problems.
*
* This function locks a mutex, as such it may sleep.
*/
void iosf_mbi_punit_acquire(void);
/**
* iosf_mbi_punit_release() - Release access to the P-Unit
*/
void iosf_mbi_punit_release(void);
/**
* iosf_mbi_register_pmic_bus_access_notifier - Register PMIC bus notifier
*
* This function can be used by drivers which may need to acquire P-Unit
* managed resources from interrupt context, where iosf_mbi_punit_acquire()
* can not be used.
*
* This function allows a driver to register a notifier to get notified (in a
* process context) before other drivers start accessing the PMIC bus.
*
* This allows the driver to acquire any resources, which it may need during
* the window the other driver is accessing the PMIC, before hand.
*
* @nb: notifier_block to register
*/
int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb);
/**
* iosf_mbi_register_pmic_bus_access_notifier - Unregister PMIC bus notifier
*
* @nb: notifier_block to unregister
*/
int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb);
/**
* iosf_mbi_call_pmic_bus_access_notifier_chain - Call PMIC bus notifier chain
*
* @val: action to pass into listener's notifier_call function
* @v: data pointer to pass into listener's notifier_call function
*/
int iosf_mbi_call_pmic_bus_access_notifier_chain(unsigned long val, void *v);
#else /* CONFIG_IOSF_MBI is not enabled */
static inline
bool iosf_mbi_available(void)
{
return false;
}
static inline
int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr)
{
WARN(1, "IOSF_MBI driver not available");
return -EPERM;
}
static inline
int iosf_mbi_write(u8 port, u8 opcode, u32 offset, u32 mdr)
{
WARN(1, "IOSF_MBI driver not available");
return -EPERM;
}
static inline
int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask)
{
WARN(1, "IOSF_MBI driver not available");
return -EPERM;
}
static inline void iosf_mbi_punit_acquire(void) {}
static inline void iosf_mbi_punit_release(void) {}
static inline
int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb)
{
return 0;
}
static inline
int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb)
{
return 0;
}
static inline
int iosf_mbi_call_pmic_bus_access_notifier_chain(unsigned long val, void *v)
{
return 0;
}
#endif /* CONFIG_IOSF_MBI */
#endif /* IOSF_MBI_SYMS_H */
|
