drivers/i2c/busses/i2c-keywest.h

   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__ */