| #ifndef __I2C_KEYWEST_H__ |
| #define __I2C_KEYWEST_H__ |
| |
| /* The Tumbler audio equalizer can be really slow sometimes */ |
| #define POLL_TIMEOUT (2*HZ) |
| |
| /* Register indices */ |
| typedef enum { |
| reg_mode = 0, |
| reg_control, |
| reg_status, |
| reg_isr, |
| reg_ier, |
| reg_addr, |
| reg_subaddr, |
| reg_data |
| } reg_t; |
| |
| |
| /* Mode register */ |
| #define KW_I2C_MODE_100KHZ 0x00 |
| #define KW_I2C_MODE_50KHZ 0x01 |
| #define KW_I2C_MODE_25KHZ 0x02 |
| #define KW_I2C_MODE_DUMB 0x00 |
| #define KW_I2C_MODE_STANDARD 0x04 |
| #define KW_I2C_MODE_STANDARDSUB 0x08 |
| #define KW_I2C_MODE_COMBINED 0x0C |
| #define KW_I2C_MODE_MODE_MASK 0x0C |
| #define KW_I2C_MODE_CHAN_MASK 0xF0 |
| |
| /* Control register */ |
| #define KW_I2C_CTL_AAK 0x01 |
| #define KW_I2C_CTL_XADDR 0x02 |
| #define KW_I2C_CTL_STOP 0x04 |
| #define KW_I2C_CTL_START 0x08 |
| |
| /* Status register */ |
| #define KW_I2C_STAT_BUSY 0x01 |
| #define KW_I2C_STAT_LAST_AAK 0x02 |
| #define KW_I2C_STAT_LAST_RW 0x04 |
| #define KW_I2C_STAT_SDA 0x08 |
| #define KW_I2C_STAT_SCL 0x10 |
| |
| /* IER & ISR registers */ |
| #define KW_I2C_IRQ_DATA 0x01 |
| #define KW_I2C_IRQ_ADDR 0x02 |
| #define KW_I2C_IRQ_STOP 0x04 |
| #define KW_I2C_IRQ_START 0x08 |
| #define KW_I2C_IRQ_MASK 0x0F |
| |
| /* Physical interface */ |
| struct keywest_iface |
| { |
| struct device_node *node; |
| void __iomem * base; |
| unsigned bsteps; |
| int irq; |
| spinlock_t lock; |
| struct keywest_chan *channels; |
| unsigned chan_count; |
| u8 cur_mode; |
| char read_write; |
| u8 *data; |
| unsigned datalen; |
| int state; |
| int result; |
| struct timer_list timeout_timer; |
| struct completion complete; |
| }; |
| |
| enum { |
| state_idle, |
| state_addr, |
| state_read, |
| state_write, |
| state_stop, |
| state_dead |
| }; |
| |
| /* Channel on an interface */ |
| struct keywest_chan |
| { |
| struct i2c_adapter adapter; |
| struct keywest_iface* iface; |
| unsigned chan_no; |
| }; |
| |
| /* Register access */ |
| |
| static inline u8 __read_reg(struct keywest_iface *iface, reg_t reg) |
| { |
| return in_8(iface->base |
| + (((unsigned)reg) << iface->bsteps)); |
| } |
| |
| static inline void __write_reg(struct keywest_iface *iface, reg_t reg, u8 val) |
| { |
| out_8(iface->base |
| + (((unsigned)reg) << iface->bsteps), val); |
| (void)__read_reg(iface, reg_subaddr); |
| } |
| |
| #define write_reg(reg, val) __write_reg(iface, reg, val) |
| #define read_reg(reg) __read_reg(iface, reg) |
| |
| |
| |
| #endif /* __I2C_KEYWEST_H__ */ |
