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exar7250.c
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1 /*
2  * SBE 2T3E3 synchronous serial card driver for Linux
3  *
4  * Copyright (C) 2009-2010 Krzysztof Halasa <[email protected]>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of version 2 of the GNU General Public License
8  * as published by the Free Software Foundation.
9  *
10  * This code is based on a driver written by SBE Inc.
11  */
12 
13 #include "2t3e3.h"
14 #include "ctrl.h"
15 
16 void exar7250_init(struct channel *sc)
17 {
18  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE,
19  SBE_2T3E3_FRAMER_VAL_T3_CBIT |
20  SBE_2T3E3_FRAMER_VAL_INTERRUPT_ENABLE_RESET |
21  SBE_2T3E3_FRAMER_VAL_TIMING_ASYNCH_TXINCLK);
22 
23  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_IO_CONTROL,
24  SBE_2T3E3_FRAMER_VAL_DISABLE_TX_LOSS_OF_CLOCK |
25  SBE_2T3E3_FRAMER_VAL_DISABLE_RX_LOSS_OF_CLOCK |
26  SBE_2T3E3_FRAMER_VAL_AMI_LINE_CODE |
27  SBE_2T3E3_FRAMER_VAL_RX_LINE_CLOCK_INVERT);
28 
29  exar7250_set_frame_type(sc, SBE_2T3E3_FRAME_TYPE_T3_CBIT);
30 }
31 
32 void exar7250_set_frame_type(struct channel *sc, u32 type)
33 {
34  u32 val;
35 
36  switch (type) {
37  case SBE_2T3E3_FRAME_TYPE_E3_G751:
38  case SBE_2T3E3_FRAME_TYPE_E3_G832:
39  case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
40  case SBE_2T3E3_FRAME_TYPE_T3_M13:
41  break;
42  default:
43  return;
44  }
45 
46  exar7250_stop_intr(sc, type);
47 
48  val = exar7250_read(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE);
49  val &= ~(SBE_2T3E3_FRAMER_VAL_LOCAL_LOOPBACK_MODE |
50  SBE_2T3E3_FRAMER_VAL_T3_E3_SELECT |
51  SBE_2T3E3_FRAMER_VAL_FRAME_FORMAT_SELECT);
52  switch (type) {
53  case SBE_2T3E3_FRAME_TYPE_E3_G751:
54  val |= SBE_2T3E3_FRAMER_VAL_E3_G751;
55  break;
56  case SBE_2T3E3_FRAME_TYPE_E3_G832:
57  val |= SBE_2T3E3_FRAMER_VAL_E3_G832;
58  break;
59  case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
60  val |= SBE_2T3E3_FRAMER_VAL_T3_CBIT;
61  break;
62  case SBE_2T3E3_FRAME_TYPE_T3_M13:
63  val |= SBE_2T3E3_FRAMER_VAL_T3_M13;
64  break;
65  default:
66  return;
67  }
68  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE, val);
69  exar7250_start_intr(sc, type);
70 }
71 
72 
73 void exar7250_start_intr(struct channel *sc, u32 type)
74 {
75  u32 val;
76 
77  switch (type) {
78  case SBE_2T3E3_FRAME_TYPE_E3_G751:
79  case SBE_2T3E3_FRAME_TYPE_E3_G832:
80  val = exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_CONFIGURATION_STATUS_2);
81 
82  cpld_LOS_update(sc);
83 
84  sc->s.OOF = val & SBE_2T3E3_FRAMER_VAL_E3_RX_OOF ? 1 : 0;
85  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_STATUS_1);
86  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_ENABLE_1,
87  SBE_2T3E3_FRAMER_VAL_E3_RX_OOF_INTERRUPT_ENABLE |
88  SBE_2T3E3_FRAMER_VAL_E3_RX_LOS_INTERRUPT_ENABLE);
89 
90  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_STATUS_2);
91  break;
92 
93  case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
94  case SBE_2T3E3_FRAME_TYPE_T3_M13:
95  val = exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_CONFIGURATION_STATUS);
96 
97  cpld_LOS_update(sc);
98 
99  sc->s.OOF = val & SBE_2T3E3_FRAMER_VAL_T3_RX_OOF ? 1 : 0;
100 
101  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_INTERRUPT_STATUS);
102  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_INTERRUPT_ENABLE,
103  SBE_2T3E3_FRAMER_VAL_T3_RX_LOS_INTERRUPT_ENABLE |
104  SBE_2T3E3_FRAMER_VAL_T3_RX_OOF_INTERRUPT_ENABLE);
105 
106  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_FEAC_INTERRUPT_ENABLE_STATUS);
107 
108  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_LAPD_CONTROL, 0);
109  break;
110 
111  default:
112  return;
113  }
114 
115  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_BLOCK_INTERRUPT_STATUS);
116  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_BLOCK_INTERRUPT_ENABLE,
117  SBE_2T3E3_FRAMER_VAL_RX_INTERRUPT_ENABLE |
118  SBE_2T3E3_FRAMER_VAL_TX_INTERRUPT_ENABLE);
119 }
120 
121 
122 void exar7250_stop_intr(struct channel *sc, u32 type)
123 {
124  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_BLOCK_INTERRUPT_ENABLE, 0);
125  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_BLOCK_INTERRUPT_STATUS);
126 
127  switch (type) {
128  case SBE_2T3E3_FRAME_TYPE_E3_G751:
129  case SBE_2T3E3_FRAME_TYPE_E3_G832:
130  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_ENABLE_1, 0);
131  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_STATUS_1);
132  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_ENABLE_2, 0);
133  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_INTERRUPT_STATUS_2);
134  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_RX_LAPD_CONTROL, 0);
135  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_RX_LAPD_CONTROL);
136  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_E3_TX_LAPD_STATUS, 0);
137  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_E3_TX_LAPD_STATUS);
138  break;
139 
140  case SBE_2T3E3_FRAME_TYPE_T3_CBIT:
141  case SBE_2T3E3_FRAME_TYPE_T3_M13:
142  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_INTERRUPT_ENABLE, 0);
143  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_INTERRUPT_STATUS);
144  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_FEAC_INTERRUPT_ENABLE_STATUS, 0);
145  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_FEAC_INTERRUPT_ENABLE_STATUS);
146  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_RX_LAPD_CONTROL, 0);
147  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_RX_LAPD_CONTROL);
148  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_TX_FEAC_CONFIGURATION_STATUS, 0);
149  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_TX_FEAC_CONFIGURATION_STATUS);
150  exar7250_write(sc, SBE_2T3E3_FRAMER_REG_T3_TX_LAPD_STATUS, 0);
151  exar7250_read(sc, SBE_2T3E3_FRAMER_REG_T3_TX_LAPD_STATUS);
152  break;
153  }
154 }
155 
156 
157 
158 
159 void exar7250_unipolar_onoff(struct channel *sc, u32 mode)
160 {
161  switch (mode) {
162  case SBE_2T3E3_OFF:
163  exar7300_clear_bit(sc, SBE_2T3E3_FRAMER_REG_IO_CONTROL,
164  SBE_2T3E3_FRAMER_VAL_UNIPOLAR);
165  break;
166  case SBE_2T3E3_ON:
167  exar7300_set_bit(sc, SBE_2T3E3_FRAMER_REG_IO_CONTROL,
168  SBE_2T3E3_FRAMER_VAL_UNIPOLAR);
169  break;
170  }
171 }
172 
173 void exar7250_set_loopback(struct channel *sc, u32 mode)
174 {
175  switch (mode) {
176  case SBE_2T3E3_FRAMER_VAL_LOOPBACK_OFF:
177  exar7300_clear_bit(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE,
178  SBE_2T3E3_FRAMER_VAL_LOCAL_LOOPBACK_MODE);
179  break;
180  case SBE_2T3E3_FRAMER_VAL_LOOPBACK_ON:
181  exar7300_set_bit(sc, SBE_2T3E3_FRAMER_REG_OPERATING_MODE,
182  SBE_2T3E3_FRAMER_VAL_LOCAL_LOOPBACK_MODE);
183  break;
184  }
185 }
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