1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * i2sbus driver -- interface register definitions
4 *
5 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6 */
7 #ifndef __I2SBUS_INTERFACE_H
8 #define __I2SBUS_INTERFACE_H
9
10 /* i2s bus control registers, at least what we know about them */
11
12 #define __PAD(m,n) u8 __pad##m[n]
13 #define _PAD(line, n) __PAD(line, n)
14 #define PAD(n) _PAD(__LINE__, (n))
15 struct i2s_interface_regs {
16 __le32 intr_ctl; /* 0x00 */
17 PAD(12);
18 __le32 serial_format; /* 0x10 */
19 PAD(12);
20 __le32 codec_msg_out; /* 0x20 */
21 PAD(12);
22 __le32 codec_msg_in; /* 0x30 */
23 PAD(12);
24 __le32 frame_count; /* 0x40 */
25 PAD(12);
26 __le32 frame_match; /* 0x50 */
27 PAD(12);
28 __le32 data_word_sizes; /* 0x60 */
29 PAD(12);
30 __le32 peak_level_sel; /* 0x70 */
31 PAD(12);
32 __le32 peak_level_in0; /* 0x80 */
33 PAD(12);
34 __le32 peak_level_in1; /* 0x90 */
35 PAD(12);
36 /* total size: 0x100 bytes */
37 } __attribute__((__packed__));
38
39 /* interrupt register is just a bitfield with
40 * interrupt enable and pending bits */
41 #define I2S_REG_INTR_CTL 0x00
42 # define I2S_INT_FRAME_COUNT (1<<31)
43 # define I2S_PENDING_FRAME_COUNT (1<<30)
44 # define I2S_INT_MESSAGE_FLAG (1<<29)
45 # define I2S_PENDING_MESSAGE_FLAG (1<<28)
46 # define I2S_INT_NEW_PEAK (1<<27)
47 # define I2S_PENDING_NEW_PEAK (1<<26)
48 # define I2S_INT_CLOCKS_STOPPED (1<<25)
49 # define I2S_PENDING_CLOCKS_STOPPED (1<<24)
50 # define I2S_INT_EXTERNAL_SYNC_ERROR (1<<23)
51 # define I2S_PENDING_EXTERNAL_SYNC_ERROR (1<<22)
52 # define I2S_INT_EXTERNAL_SYNC_OK (1<<21)
53 # define I2S_PENDING_EXTERNAL_SYNC_OK (1<<20)
54 # define I2S_INT_NEW_SAMPLE_RATE (1<<19)
55 # define I2S_PENDING_NEW_SAMPLE_RATE (1<<18)
56 # define I2S_INT_STATUS_FLAG (1<<17)
57 # define I2S_PENDING_STATUS_FLAG (1<<16)
58
59 /* serial format register is more interesting :)
60 * It contains:
61 * - clock source
62 * - MClk divisor
63 * - SClk divisor
64 * - SClk master flag
65 * - serial format (sony, i2s 64x, i2s 32x, dav, silabs)
66 * - external sample frequency interrupt (don't understand)
67 * - external sample frequency
68 */
69 #define I2S_REG_SERIAL_FORMAT 0x10
70 /* clock source. You get either 18.432, 45.1584 or 49.1520 MHz */
71 # define I2S_SF_CLOCK_SOURCE_SHIFT 30
72 # define I2S_SF_CLOCK_SOURCE_MASK (3<<I2S_SF_CLOCK_SOURCE_SHIFT)
73 # define I2S_SF_CLOCK_SOURCE_18MHz (0<<I2S_SF_CLOCK_SOURCE_SHIFT)
74 # define I2S_SF_CLOCK_SOURCE_45MHz (1<<I2S_SF_CLOCK_SOURCE_SHIFT)
75 # define I2S_SF_CLOCK_SOURCE_49MHz (2<<I2S_SF_CLOCK_SOURCE_SHIFT)
76 /* also, let's define the exact clock speeds here, in Hz */
77 #define I2S_CLOCK_SPEED_18MHz 18432000
78 #define I2S_CLOCK_SPEED_45MHz 45158400
79 #define I2S_CLOCK_SPEED_49MHz 49152000
80 /* MClk is the clock that drives the codec, usually called its 'system clock'.
81 * It is derived by taking only every 'divisor' tick of the clock.
82 */
83 # define I2S_SF_MCLKDIV_SHIFT 24
84 # define I2S_SF_MCLKDIV_MASK (0x1F<<I2S_SF_MCLKDIV_SHIFT)
85 # define I2S_SF_MCLKDIV_1 (0x14<<I2S_SF_MCLKDIV_SHIFT)
86 # define I2S_SF_MCLKDIV_3 (0x13<<I2S_SF_MCLKDIV_SHIFT)
87 # define I2S_SF_MCLKDIV_5 (0x12<<I2S_SF_MCLKDIV_SHIFT)
88 # define I2S_SF_MCLKDIV_14 (0x0E<<I2S_SF_MCLKDIV_SHIFT)
89 # define I2S_SF_MCLKDIV_OTHER(div) (((div/2-1)<<I2S_SF_MCLKDIV_SHIFT)&I2S_SF_MCLKDIV_MASK)
i2s_sf_mclkdiv(int div,int * out)90 static inline int i2s_sf_mclkdiv(int div, int *out)
91 {
92 int d;
93
94 switch(div) {
95 case 1: *out |= I2S_SF_MCLKDIV_1; return 0;
96 case 3: *out |= I2S_SF_MCLKDIV_3; return 0;
97 case 5: *out |= I2S_SF_MCLKDIV_5; return 0;
98 case 14: *out |= I2S_SF_MCLKDIV_14; return 0;
99 default:
100 if (div%2) return -1;
101 d = div/2-1;
102 if (d == 0x14 || d == 0x13 || d == 0x12 || d == 0x0E)
103 return -1;
104 *out |= I2S_SF_MCLKDIV_OTHER(div);
105 return 0;
106 }
107 }
108 /* SClk is the clock that drives the i2s wire bus. Note that it is
109 * derived from the MClk above by taking only every 'divisor' tick
110 * of MClk.
111 */
112 # define I2S_SF_SCLKDIV_SHIFT 20
113 # define I2S_SF_SCLKDIV_MASK (0xF<<I2S_SF_SCLKDIV_SHIFT)
114 # define I2S_SF_SCLKDIV_1 (8<<I2S_SF_SCLKDIV_SHIFT)
115 # define I2S_SF_SCLKDIV_3 (9<<I2S_SF_SCLKDIV_SHIFT)
116 # define I2S_SF_SCLKDIV_OTHER(div) (((div/2-1)<<I2S_SF_SCLKDIV_SHIFT)&I2S_SF_SCLKDIV_MASK)
i2s_sf_sclkdiv(int div,int * out)117 static inline int i2s_sf_sclkdiv(int div, int *out)
118 {
119 int d;
120
121 switch(div) {
122 case 1: *out |= I2S_SF_SCLKDIV_1; return 0;
123 case 3: *out |= I2S_SF_SCLKDIV_3; return 0;
124 default:
125 if (div%2) return -1;
126 d = div/2-1;
127 if (d == 8 || d == 9) return -1;
128 *out |= I2S_SF_SCLKDIV_OTHER(div);
129 return 0;
130 }
131 }
132 # define I2S_SF_SCLK_MASTER (1<<19)
133 /* serial format is the way the data is put to the i2s wire bus */
134 # define I2S_SF_SERIAL_FORMAT_SHIFT 16
135 # define I2S_SF_SERIAL_FORMAT_MASK (7<<I2S_SF_SERIAL_FORMAT_SHIFT)
136 # define I2S_SF_SERIAL_FORMAT_SONY (0<<I2S_SF_SERIAL_FORMAT_SHIFT)
137 # define I2S_SF_SERIAL_FORMAT_I2S_64X (1<<I2S_SF_SERIAL_FORMAT_SHIFT)
138 # define I2S_SF_SERIAL_FORMAT_I2S_32X (2<<I2S_SF_SERIAL_FORMAT_SHIFT)
139 # define I2S_SF_SERIAL_FORMAT_I2S_DAV (4<<I2S_SF_SERIAL_FORMAT_SHIFT)
140 # define I2S_SF_SERIAL_FORMAT_I2S_SILABS (5<<I2S_SF_SERIAL_FORMAT_SHIFT)
141 /* unknown */
142 # define I2S_SF_EXT_SAMPLE_FREQ_INT_SHIFT 12
143 # define I2S_SF_EXT_SAMPLE_FREQ_INT_MASK (0xF<<I2S_SF_SAMPLE_FREQ_INT_SHIFT)
144 /* probably gives external frequency? */
145 # define I2S_SF_EXT_SAMPLE_FREQ_MASK 0xFFF
146
147 /* used to send codec messages, but how isn't clear */
148 #define I2S_REG_CODEC_MSG_OUT 0x20
149
150 /* used to receive codec messages, but how isn't clear */
151 #define I2S_REG_CODEC_MSG_IN 0x30
152
153 /* frame count reg isn't clear to me yet, but probably useful */
154 #define I2S_REG_FRAME_COUNT 0x40
155
156 /* program to some value, and get interrupt if frame count reaches it */
157 #define I2S_REG_FRAME_MATCH 0x50
158
159 /* this register describes how the bus transfers data */
160 #define I2S_REG_DATA_WORD_SIZES 0x60
161 /* number of interleaved input channels */
162 # define I2S_DWS_NUM_CHANNELS_IN_SHIFT 24
163 # define I2S_DWS_NUM_CHANNELS_IN_MASK (0x1F<<I2S_DWS_NUM_CHANNELS_IN_SHIFT)
164 /* word size of input data */
165 # define I2S_DWS_DATA_IN_SIZE_SHIFT 16
166 # define I2S_DWS_DATA_IN_16BIT (0<<I2S_DWS_DATA_IN_SIZE_SHIFT)
167 # define I2S_DWS_DATA_IN_24BIT (3<<I2S_DWS_DATA_IN_SIZE_SHIFT)
168 /* number of interleaved output channels */
169 # define I2S_DWS_NUM_CHANNELS_OUT_SHIFT 8
170 # define I2S_DWS_NUM_CHANNELS_OUT_MASK (0x1F<<I2S_DWS_NUM_CHANNELS_OUT_SHIFT)
171 /* word size of output data */
172 # define I2S_DWS_DATA_OUT_SIZE_SHIFT 0
173 # define I2S_DWS_DATA_OUT_16BIT (0<<I2S_DWS_DATA_OUT_SIZE_SHIFT)
174 # define I2S_DWS_DATA_OUT_24BIT (3<<I2S_DWS_DATA_OUT_SIZE_SHIFT)
175
176
177 /* unknown */
178 #define I2S_REG_PEAK_LEVEL_SEL 0x70
179
180 /* unknown */
181 #define I2S_REG_PEAK_LEVEL_IN0 0x80
182
183 /* unknown */
184 #define I2S_REG_PEAK_LEVEL_IN1 0x90
185
186 #endif /* __I2SBUS_INTERFACE_H */
187