1 /*
2 * TI DaVinci Audio Serial Port support
3 *
4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation version 2.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether express or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16 #ifndef __DAVINCI_ASP_H
17 #define __DAVINCI_ASP_H
18
19 #include <linux/genalloc.h>
20
21 struct davinci_mcasp_pdata {
22 u32 tx_dma_offset;
23 u32 rx_dma_offset;
24 int asp_chan_q; /* event queue number for ASP channel */
25 int ram_chan_q; /* event queue number for RAM channel */
26 /*
27 * Allowing this is more efficient and eliminates left and right swaps
28 * caused by underruns, but will swap the left and right channels
29 * when compared to previous behavior.
30 */
31 unsigned enable_channel_combine:1;
32 unsigned sram_size_playback;
33 unsigned sram_size_capture;
34 struct gen_pool *sram_pool;
35
36 /*
37 * If McBSP peripheral gets the clock from an external pin,
38 * there are three chooses, that are MCBSP_CLKX, MCBSP_CLKR
39 * and MCBSP_CLKS.
40 * Depending on different hardware connections it is possible
41 * to use this setting to change the behaviour of McBSP
42 * driver.
43 */
44 int clk_input_pin;
45
46 /*
47 * This flag works when both clock and FS are outputs for the cpu
48 * and makes clock more accurate (FS is not symmetrical and the
49 * clock is very fast.
50 * The clock becoming faster is named
51 * i2s continuous serial clock (I2S_SCK) and it is an externally
52 * visible bit clock.
53 *
54 * first line : WordSelect
55 * second line : ContinuousSerialClock
56 * third line: SerialData
57 *
58 * SYMMETRICAL APPROACH:
59 * _______________________ LEFT
60 * _| RIGHT |______________________|
61 * _ _ _ _ _ _ _ _
62 * _| |_| |_ x16 _| |_| |_| |_| |_ x16 _| |_| |_
63 * _ _ _ _ _ _ _ _
64 * _/ \_/ \_ ... _/ \_/ \_/ \_/ \_ ... _/ \_/ \_
65 * \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/
66 *
67 * ACCURATE CLOCK APPROACH:
68 * ______________ LEFT
69 * _| RIGHT |_______________________________|
70 * _ _ _ _ _ _ _ _ _
71 * _| |_ x16 _| |_| |_ x16 _| |_| |_| |_| |_| |_| |
72 * _ _ _ _ dummy cycles
73 * _/ \_ ... _/ \_/ \_ ... _/ \__________________
74 * \_/ \_/ \_/ \_/
75 *
76 */
77 bool i2s_accurate_sck;
78
79 /* McASP specific fields */
80 int tdm_slots;
81 u8 op_mode;
82 u8 dismod;
83 u8 num_serializer;
84 u8 *serial_dir;
85 u8 version;
86 u8 txnumevt;
87 u8 rxnumevt;
88 int tx_dma_channel;
89 int rx_dma_channel;
90 };
91 /* TODO: Fix arch/arm/mach-davinci/ users and remove this define */
92 #define snd_platform_data davinci_mcasp_pdata
93
94 enum {
95 MCASP_VERSION_1 = 0, /* DM646x */
96 MCASP_VERSION_2, /* DA8xx/OMAPL1x */
97 MCASP_VERSION_3, /* TI81xx/AM33xx */
98 MCASP_VERSION_4, /* DRA7xxx */
99 };
100
101 enum mcbsp_clk_input_pin {
102 MCBSP_CLKR = 0, /* as in DM365 */
103 MCBSP_CLKS,
104 };
105
106 #define INACTIVE_MODE 0
107 #define TX_MODE 1
108 #define RX_MODE 2
109
110 #define DAVINCI_MCASP_IIS_MODE 0
111 #define DAVINCI_MCASP_DIT_MODE 1
112
113 #endif