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1da177e4 LT |
1 | #ifndef __I2C_KEYWEST_H__ |
2 | #define __I2C_KEYWEST_H__ | |
3 | ||
4 | /* The Tumbler audio equalizer can be really slow sometimes */ | |
5 | #define POLL_TIMEOUT (2*HZ) | |
6 | ||
7 | /* Register indices */ | |
8 | typedef enum { | |
9 | reg_mode = 0, | |
10 | reg_control, | |
11 | reg_status, | |
12 | reg_isr, | |
13 | reg_ier, | |
14 | reg_addr, | |
15 | reg_subaddr, | |
16 | reg_data | |
17 | } reg_t; | |
18 | ||
19 | ||
20 | /* Mode register */ | |
21 | #define KW_I2C_MODE_100KHZ 0x00 | |
22 | #define KW_I2C_MODE_50KHZ 0x01 | |
23 | #define KW_I2C_MODE_25KHZ 0x02 | |
24 | #define KW_I2C_MODE_DUMB 0x00 | |
25 | #define KW_I2C_MODE_STANDARD 0x04 | |
26 | #define KW_I2C_MODE_STANDARDSUB 0x08 | |
27 | #define KW_I2C_MODE_COMBINED 0x0C | |
28 | #define KW_I2C_MODE_MODE_MASK 0x0C | |
29 | #define KW_I2C_MODE_CHAN_MASK 0xF0 | |
30 | ||
31 | /* Control register */ | |
32 | #define KW_I2C_CTL_AAK 0x01 | |
33 | #define KW_I2C_CTL_XADDR 0x02 | |
34 | #define KW_I2C_CTL_STOP 0x04 | |
35 | #define KW_I2C_CTL_START 0x08 | |
36 | ||
37 | /* Status register */ | |
38 | #define KW_I2C_STAT_BUSY 0x01 | |
39 | #define KW_I2C_STAT_LAST_AAK 0x02 | |
40 | #define KW_I2C_STAT_LAST_RW 0x04 | |
41 | #define KW_I2C_STAT_SDA 0x08 | |
42 | #define KW_I2C_STAT_SCL 0x10 | |
43 | ||
44 | /* IER & ISR registers */ | |
45 | #define KW_I2C_IRQ_DATA 0x01 | |
46 | #define KW_I2C_IRQ_ADDR 0x02 | |
47 | #define KW_I2C_IRQ_STOP 0x04 | |
48 | #define KW_I2C_IRQ_START 0x08 | |
49 | #define KW_I2C_IRQ_MASK 0x0F | |
50 | ||
51 | /* Physical interface */ | |
52 | struct keywest_iface | |
53 | { | |
54 | struct device_node *node; | |
55 | void __iomem * base; | |
56 | unsigned bsteps; | |
57 | int irq; | |
58 | spinlock_t lock; | |
59 | struct keywest_chan *channels; | |
60 | unsigned chan_count; | |
61 | u8 cur_mode; | |
62 | char read_write; | |
63 | u8 *data; | |
64 | unsigned datalen; | |
65 | int state; | |
66 | int result; | |
67 | struct timer_list timeout_timer; | |
68 | struct completion complete; | |
69 | }; | |
70 | ||
71 | enum { | |
72 | state_idle, | |
73 | state_addr, | |
74 | state_read, | |
75 | state_write, | |
76 | state_stop, | |
77 | state_dead | |
78 | }; | |
79 | ||
80 | /* Channel on an interface */ | |
81 | struct keywest_chan | |
82 | { | |
83 | struct i2c_adapter adapter; | |
84 | struct keywest_iface* iface; | |
85 | unsigned chan_no; | |
86 | }; | |
87 | ||
88 | /* Register access */ | |
89 | ||
90 | static inline u8 __read_reg(struct keywest_iface *iface, reg_t reg) | |
91 | { | |
92 | return in_8(iface->base | |
93 | + (((unsigned)reg) << iface->bsteps)); | |
94 | } | |
95 | ||
96 | static inline void __write_reg(struct keywest_iface *iface, reg_t reg, u8 val) | |
97 | { | |
98 | out_8(iface->base | |
99 | + (((unsigned)reg) << iface->bsteps), val); | |
100 | (void)__read_reg(iface, reg_subaddr); | |
101 | } | |
102 | ||
103 | #define write_reg(reg, val) __write_reg(iface, reg, val) | |
104 | #define read_reg(reg) __read_reg(iface, reg) | |
105 | ||
106 | ||
107 | ||
108 | #endif /* __I2C_KEYWEST_H__ */ |