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
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* FSI master definitions. These comprise the core <--> master interface,
* to allow the core to interact with the (hardware-specific) masters.
*
* Copyright (C) IBM Corporation 2016
*/
#ifndef DRIVERS_FSI_MASTER_H
#define DRIVERS_FSI_MASTER_H
#include <linux/device.h>
#include <linux/mutex.h>
/*
* Master registers
*
* These are used by hardware masters, such as the one in the FSP2, AST2600 and
* the hub master in POWER processors.
*/
/* Control Registers */
#define FSI_MMODE 0x0 /* R/W: mode */
#define FSI_MDLYR 0x4 /* R/W: delay */
#define FSI_MCRSP 0x8 /* R/W: clock rate */
#define FSI_MENP0 0x10 /* R/W: enable */
#define FSI_MLEVP0 0x18 /* R: plug detect */
#define FSI_MSENP0 0x18 /* S: Set enable */
#define FSI_MCENP0 0x20 /* C: Clear enable */
#define FSI_MAEB 0x70 /* R: Error address */
#define FSI_MVER 0x74 /* R: master version/type */
#define FSI_MSTAP0 0xd0 /* R: Port status */
#define FSI_MRESP0 0xd0 /* W: Port reset */
#define FSI_MESRB0 0x1d0 /* R: Master error status */
#define FSI_MRESB0 0x1d0 /* W: Reset bridge */
#define FSI_MSCSB0 0x1d4 /* R: Master sub command stack */
#define FSI_MATRB0 0x1d8 /* R: Master address trace */
#define FSI_MDTRB0 0x1dc /* R: Master data trace */
#define FSI_MECTRL 0x2e0 /* W: Error control */
/* MMODE: Mode control */
#define FSI_MMODE_EIP 0x80000000 /* Enable interrupt polling */
#define FSI_MMODE_ECRC 0x40000000 /* Enable error recovery */
#define FSI_MMODE_RELA 0x20000000 /* Enable relative address commands */
#define FSI_MMODE_EPC 0x10000000 /* Enable parity checking */
#define FSI_MMODE_P8_TO_LSB 0x00000010 /* Timeout value LSB */
/* MSB=1, LSB=0 is 0.8 ms */
/* MSB=0, LSB=1 is 0.9 ms */
#define FSI_MMODE_CRS0SHFT 18 /* Clk rate selection 0 shift */
#define FSI_MMODE_CRS0MASK 0x3ff /* Clk rate selection 0 mask */
#define FSI_MMODE_CRS1SHFT 8 /* Clk rate selection 1 shift */
#define FSI_MMODE_CRS1MASK 0x3ff /* Clk rate selection 1 mask */
/* MRESB: Reset brindge */
#define FSI_MRESB_RST_GEN 0x80000000 /* General reset */
#define FSI_MRESB_RST_ERR 0x40000000 /* Error Reset */
/* MRESP: Reset port */
#define FSI_MRESP_RST_ALL_MASTER 0x20000000 /* Reset all FSI masters */
#define FSI_MRESP_RST_ALL_LINK 0x10000000 /* Reset all FSI port contr. */
#define FSI_MRESP_RST_MCR 0x08000000 /* Reset FSI master reg. */
#define FSI_MRESP_RST_PYE 0x04000000 /* Reset FSI parity error */
#define FSI_MRESP_RST_ALL 0xfc000000 /* Reset any error */
/* MECTRL: Error control */
#define FSI_MECTRL_EOAE 0x8000 /* Enable machine check when */
/* master 0 in error */
#define FSI_MECTRL_P8_AUTO_TERM 0x4000 /* Auto terminate */
#define FSI_HUB_LINK_OFFSET 0x80000
#define FSI_HUB_LINK_SIZE 0x80000
#define FSI_HUB_MASTER_MAX_LINKS 8
/*
* Protocol definitions
*
* These are used by low level masters that bit-bang out the protocol
*/
/* Various protocol delays */
#define FSI_ECHO_DELAY_CLOCKS 16 /* Number clocks for echo delay */
#define FSI_SEND_DELAY_CLOCKS 16 /* Number clocks for send delay */
#define FSI_PRE_BREAK_CLOCKS 50 /* Number clocks to prep for break */
#define FSI_BREAK_CLOCKS 256 /* Number of clocks to issue break */
#define FSI_POST_BREAK_CLOCKS 16000 /* Number clocks to set up cfam */
#define FSI_INIT_CLOCKS 5000 /* Clock out any old data */
#define FSI_MASTER_DPOLL_CLOCKS 50 /* < 21 will cause slave to hang */
#define FSI_MASTER_EPOLL_CLOCKS 50 /* Number of clocks for E_POLL retry */
/* Various retry maximums */
#define FSI_CRC_ERR_RETRIES 10
#define FSI_MASTER_MAX_BUSY 200
#define FSI_MASTER_MTOE_COUNT 1000
/* Command encodings */
#define FSI_CMD_DPOLL 0x2
#define FSI_CMD_EPOLL 0x3
#define FSI_CMD_TERM 0x3f
#define FSI_CMD_ABS_AR 0x4
#define FSI_CMD_REL_AR 0x5
#define FSI_CMD_SAME_AR 0x3 /* but only a 2-bit opcode... */
/* Slave responses */
#define FSI_RESP_ACK 0 /* Success */
#define FSI_RESP_BUSY 1 /* Slave busy */
#define FSI_RESP_ERRA 2 /* Any (misc) Error */
#define FSI_RESP_ERRC 3 /* Slave reports master CRC error */
/* Misc */
#define FSI_CRC_SIZE 4
/* fsi-master definition and flags */
#define FSI_MASTER_FLAG_SWCLOCK 0x1
/*
* Structures and function prototypes
*
* These are common to all masters
*/
struct fsi_master {
struct device dev;
int idx;
int n_links;
int flags;
struct mutex scan_lock;
int (*read)(struct fsi_master *, int link, uint8_t id,
uint32_t addr, void *val, size_t size);
int (*write)(struct fsi_master *, int link, uint8_t id,
uint32_t addr, const void *val, size_t size);
int (*term)(struct fsi_master *, int link, uint8_t id);
int (*send_break)(struct fsi_master *, int link);
int (*link_enable)(struct fsi_master *, int link);
int (*link_config)(struct fsi_master *, int link,
u8 t_send_delay, u8 t_echo_delay);
};
#define dev_to_fsi_master(d) container_of(d, struct fsi_master, dev)
/**
* fsi_master registration & lifetime: the fsi_master_register() and
* fsi_master_unregister() functions will take ownership of the master, and
* ->dev in particular. The registration path performs a get_device(), which
* takes the first reference on the device. Similarly, the unregistration path
* performs a put_device(), which may well drop the last reference.
*
* This means that master implementations *may* need to hold their own
* reference (via get_device()) on master->dev. In particular, if the device's
* ->release callback frees the fsi_master, then fsi_master_unregister will
* invoke this free if no other reference is held.
*
* The same applies for the error path of fsi_master_register; if the call
* fails, dev->release will have been invoked.
*/
extern int fsi_master_register(struct fsi_master *master);
extern void fsi_master_unregister(struct fsi_master *master);
extern int fsi_master_rescan(struct fsi_master *master);
#endif /* DRIVERS_FSI_MASTER_H */
|
