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
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/*
* (C) Copyright 2001
* Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* The original I2C interface was
* (C) 2000 by Paolo Scaffardi (arsenio@tin.it)
* AIRVENT SAM s.p.a - RIMINI(ITALY)
* but has been changed substantially.
*/
#ifndef _I2C_H_
#define _I2C_H_
/*
* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
*
* The implementation MUST NOT use static or global variables if the
* I2C routines are used to read SDRAM configuration information
* because this is done before the memories are initialized. Limited
* use of stack-based variables are OK (the initial stack size is
* limited).
*
* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
*/
/*
* Configuration items.
*/
#define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */
#ifdef CONFIG_I2C_MULTI_BUS
#define MAX_I2C_BUS 2
#define I2C_MULTI_BUS 1
#else
#define MAX_I2C_BUS 1
#define I2C_MULTI_BUS 0
#endif
#if !defined(CONFIG_SYS_MAX_I2C_BUS)
#define CONFIG_SYS_MAX_I2C_BUS MAX_I2C_BUS
#endif
/* define the I2C bus number for RTC and DTT if not already done */
#if !defined(CONFIG_SYS_RTC_BUS_NUM)
#define CONFIG_SYS_RTC_BUS_NUM 0
#endif
#if !defined(CONFIG_SYS_DTT_BUS_NUM)
#define CONFIG_SYS_DTT_BUS_NUM 0
#endif
#if !defined(CONFIG_SYS_SPD_BUS_NUM)
#define CONFIG_SYS_SPD_BUS_NUM 0
#endif
#ifndef I2C_SOFT_DECLARATIONS
# if defined(CONFIG_MPC8260)
# define I2C_SOFT_DECLARATIONS volatile ioport_t *iop = ioport_addr((immap_t *)CONFIG_SYS_IMMR, I2C_PORT);
# elif defined(CONFIG_8xx)
# define I2C_SOFT_DECLARATIONS volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
# elif (defined(CONFIG_AT91RM9200) || \
defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9261) || \
defined(CONFIG_AT91SAM9263)) && !defined(CONFIG_AT91_LEGACY)
# define I2C_SOFT_DECLARATIONS at91_pio_t *pio = (at91_pio_t *) ATMEL_BASE_PIOA;
# else
# define I2C_SOFT_DECLARATIONS
# endif
#endif
#ifdef CONFIG_8xx
/* Set default value for the I2C bus speed on 8xx. In the
* future, we'll define these in all 8xx board config files.
*/
#ifndef CONFIG_SYS_I2C_SPEED
#define CONFIG_SYS_I2C_SPEED 50000
#endif
#endif
/*
* Many boards/controllers/drivers don't support an I2C slave interface so
* provide a default slave address for them for use in common code. A real
* value for CONFIG_SYS_I2C_SLAVE should be defined for any board which does
* support a slave interface.
*/
#ifndef CONFIG_SYS_I2C_SLAVE
#define CONFIG_SYS_I2C_SLAVE 0xfe
#endif
/*
* Initialization, must be called once on start up, may be called
* repeatedly to change the speed and slave addresses.
*/
void i2c_init(int speed, int slaveaddr);
void i2c_init_board(void);
#ifdef CONFIG_SYS_I2C_BOARD_LATE_INIT
void i2c_board_late_init(void);
#endif
#if defined(CONFIG_I2C_MUX)
typedef struct _mux {
uchar chip;
uchar channel;
char *name;
struct _mux *next;
} I2C_MUX;
typedef struct _mux_device {
int busid;
I2C_MUX *mux; /* List of muxes, to reach the device */
struct _mux_device *next;
} I2C_MUX_DEVICE;
I2C_MUX_DEVICE *i2c_mux_search_device(int id);
I2C_MUX_DEVICE *i2c_mux_ident_muxstring (uchar *buf);
int i2x_mux_select_mux(int bus);
int i2c_mux_ident_muxstring_f (uchar *buf);
#endif
/*
* Probe the given I2C chip address. Returns 0 if a chip responded,
* not 0 on failure.
*/
int i2c_probe(uchar chip);
/*
* Read/Write interface:
* chip: I2C chip address, range 0..127
* addr: Memory (register) address within the chip
* alen: Number of bytes to use for addr (typically 1, 2 for larger
* memories, 0 for register type devices with only one
* register)
* buffer: Where to read/write the data
* len: How many bytes to read/write
*
* Returns: 0 on success, not 0 on failure
*/
int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len);
int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len);
/*
* Utility routines to read/write registers.
*/
static inline u8 i2c_reg_read(u8 addr, u8 reg)
{
u8 buf;
#ifdef CONFIG_8xx
/* MPC8xx needs this. Maybe one day we can get rid of it. */
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
#endif
#ifdef DEBUG
printf("%s: addr=0x%02x, reg=0x%02x\n", __func__, addr, reg);
#endif
i2c_read(addr, reg, 1, &buf, 1);
return buf;
}
static inline void i2c_reg_write(u8 addr, u8 reg, u8 val)
{
#ifdef CONFIG_8xx
/* MPC8xx needs this. Maybe one day we can get rid of it. */
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
#endif
#ifdef DEBUG
printf("%s: addr=0x%02x, reg=0x%02x, val=0x%02x\n",
__func__, addr, reg, val);
#endif
i2c_write(addr, reg, 1, &val, 1);
}
/*
* Functions for setting the current I2C bus and its speed
*/
/*
* i2c_set_bus_num:
*
* Change the active I2C bus. Subsequent read/write calls will
* go to this one.
*
* bus - bus index, zero based
*
* Returns: 0 on success, not 0 on failure
*
*/
int i2c_set_bus_num(unsigned int bus);
/*
* i2c_get_bus_num:
*
* Returns index of currently active I2C bus. Zero-based.
*/
unsigned int i2c_get_bus_num(void);
/*
* i2c_set_bus_speed:
*
* Change the speed of the active I2C bus
*
* speed - bus speed in Hz
*
* Returns: 0 on success, not 0 on failure
*
*/
int i2c_set_bus_speed(unsigned int);
/*
* i2c_get_bus_speed:
*
* Returns speed of currently active I2C bus in Hz
*/
unsigned int i2c_get_bus_speed(void);
/* NOTE: These two functions MUST be always_inline to avoid code growth! */
static inline unsigned int I2C_GET_BUS(void) __attribute__((always_inline));
static inline unsigned int I2C_GET_BUS(void)
{
return I2C_MULTI_BUS ? i2c_get_bus_num() : 0;
}
static inline void I2C_SET_BUS(unsigned int bus) __attribute__((always_inline));
static inline void I2C_SET_BUS(unsigned int bus)
{
if (I2C_MULTI_BUS)
i2c_set_bus_num(bus);
}
#endif /* _I2C_H_ */
|
