1 | /* MCF5206e MBUS module (I2C bus) driver header file |
---|
2 | * |
---|
3 | * Copyright (C) 2000 OKTET Ltd., St.-Petersburg, Russia |
---|
4 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
---|
5 | * |
---|
6 | * The license and distribution terms for this file may be |
---|
7 | * found in the file LICENSE in this distribution or at |
---|
8 | * |
---|
9 | * http://www.rtems.com/license/LICENSE. |
---|
10 | * |
---|
11 | * @(#) $Id$ |
---|
12 | */ |
---|
13 | |
---|
14 | #ifndef __MCFBSP_MCFMBUS_H__ |
---|
15 | #define __MCFBSP_MCFMBUS_H__ |
---|
16 | |
---|
17 | #include "mcf5206e.h" |
---|
18 | #include "i2c.h" |
---|
19 | |
---|
20 | /* States of I2C machine */ |
---|
21 | typedef enum mcfmbus_i2c_state { |
---|
22 | STATE_IDLE, |
---|
23 | STATE_ADDR_7, |
---|
24 | STATE_ADDR_1_W, |
---|
25 | STATE_ADDR_1_R, |
---|
26 | STATE_SENDING, |
---|
27 | STATE_RECEIVING |
---|
28 | } mcfmbus_i2c_state; |
---|
29 | |
---|
30 | typedef struct mcfmbus { |
---|
31 | uint32_t base; /* ColdFire internal peripherial base |
---|
32 | address */ |
---|
33 | enum mcfmbus_i2c_state state;/* State of I2C machine */ |
---|
34 | i2c_message *msg; /* Pointer to the first message in transfer */ |
---|
35 | int nmsg; /* Number of messages in transfer */ |
---|
36 | i2c_message *cmsg; /* Current message */ |
---|
37 | int byte; /* Byte number in current message */ |
---|
38 | rtems_isr_entry oldisr; /* Old interrupt handler */ |
---|
39 | rtems_id sema; /* MBUS semaphore */ |
---|
40 | i2c_transfer_done done; /* Transfer done function */ |
---|
41 | uint32_t done_arg; /* Done function argument */ |
---|
42 | } mcfmbus; |
---|
43 | |
---|
44 | /* mcfmbus_initialize -- |
---|
45 | * Initialize ColdFire MBUS I2C bus controller. |
---|
46 | * |
---|
47 | * PARAMETERS: |
---|
48 | * i2c_bus - pointer to the bus descriptor structure |
---|
49 | * base - ColdFire internal peripherial base address |
---|
50 | * |
---|
51 | * RETURNS: |
---|
52 | * RTEMS_SUCCESSFUL, or RTEMS error code when initialization failed. |
---|
53 | */ |
---|
54 | rtems_status_code |
---|
55 | mcfmbus_initialize(mcfmbus *i2c_bus, uint32_t base); |
---|
56 | |
---|
57 | /* mcfmbus_select_clock_divider -- |
---|
58 | * Select divider for system clock which is used for I2C bus clock |
---|
59 | * generation. Not each divider can be selected for I2C bus; this |
---|
60 | * function select nearest larger or equal divider, or maximum |
---|
61 | * possible divider, if passed value greater. |
---|
62 | * |
---|
63 | * PARAMETERS: |
---|
64 | * i2c_bus - pointer to the bus descriptor structure |
---|
65 | * divider - system frequency divider for I2C serial clock. |
---|
66 | * |
---|
67 | * RETURNS: |
---|
68 | * RTEMS_SUCCESSFUL, if operation performed successfully, or |
---|
69 | * RTEMS error code when failed. |
---|
70 | */ |
---|
71 | rtems_status_code |
---|
72 | mcfmbus_select_clock_divider(mcfmbus *i2c_bus, int divider); |
---|
73 | |
---|
74 | /* mcfmbus_i2c_transfer -- |
---|
75 | * Initiate multiple-messages transfer over I2C bus via ColdFire MBUS |
---|
76 | * controller. |
---|
77 | * |
---|
78 | * PARAMETERS: |
---|
79 | * bus - pointer to MBUS controller descriptor |
---|
80 | * nmsg - number of messages |
---|
81 | * msg - pointer to messages array |
---|
82 | * done - function which is called when transfer is finished |
---|
83 | * done_arg - arbitrary argument passed to done funciton |
---|
84 | * |
---|
85 | * RETURNS: |
---|
86 | * RTEMS_SUCCESSFUL if transfer initiated successfully, or error |
---|
87 | * code when failed. |
---|
88 | */ |
---|
89 | rtems_status_code |
---|
90 | mcfmbus_i2c_transfer(mcfmbus *bus, int nmsg, i2c_message *msg, |
---|
91 | i2c_transfer_done done, uint32_t done_arg); |
---|
92 | |
---|
93 | /* mcfmbus_i2c_done -- |
---|
94 | * Close ColdFire MBUS I2C bus controller and release all resources. |
---|
95 | * |
---|
96 | * PARAMETERS: |
---|
97 | * bus - pointer to MBUS controller descriptor |
---|
98 | * |
---|
99 | * RETURNS: |
---|
100 | * RTEMS_SUCCESSFUL, if transfer initiated successfully, or error |
---|
101 | * code when failed. |
---|
102 | */ |
---|
103 | rtems_status_code |
---|
104 | mcfmbus_i2c_done(mcfmbus *i2c_bus); |
---|
105 | |
---|
106 | /* mcfmbus_i2c_interrupt_handler -- |
---|
107 | * ColdFire MBUS I2C bus controller interrupt handler. This function |
---|
108 | * called from real interrupt handler, and pointer to MBUS descriptor |
---|
109 | * structure passed to this function. |
---|
110 | * |
---|
111 | * PARAMETERS: |
---|
112 | * bus - pointert to the bus descriptor structure |
---|
113 | * |
---|
114 | * RETURNS: |
---|
115 | * none |
---|
116 | */ |
---|
117 | void mcfmbus_i2c_interrupt_handler(mcfmbus *bus); |
---|
118 | |
---|
119 | /* mcfmbus_poll -- |
---|
120 | * MBUS module poll routine; used to poll events when I2C driver |
---|
121 | * operates in poll-driven mode. |
---|
122 | * |
---|
123 | * PARAMETERS: |
---|
124 | * none |
---|
125 | * |
---|
126 | * RETURNS: |
---|
127 | * none |
---|
128 | */ |
---|
129 | void mcfmbus_poll(mcfmbus *bus); |
---|
130 | |
---|
131 | #endif /* __MCFBSP_MCFMBUS_H__ */ |
---|