| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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__ */ |