drivers/i2c/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         unsigned long           base;
  55         unsigned                bsteps;
  56         int                     irq;
  57         struct semaphore        sem;
  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         int                     stopretry;
  68         struct timer_list       timeout_timer;
  69         struct completion       complete;
  70         struct keywest_iface*   next;
  71 };
  72
  73 enum {
  74         state_idle,
  75         state_addr,
  76         state_read,
  77         state_write,
  78         state_stop,
  79         state_dead
  80 };
  81
  82 /* Channel on an interface */
  83 struct keywest_chan
  84 {
  85         struct i2c_adapter      adapter;
  86         struct keywest_iface*   iface;
  87         unsigned                chan_no;
  88 };
  89
  90 /* Register access */
  91
  92 static inline u8 __read_reg(struct keywest_iface *iface, reg_t reg)
  93 {
  94         return in_8(((volatile u8 *)iface->base)
  95                 + (((unsigned)reg) << iface->bsteps));
  96 }
  97
  98 static inline void __write_reg(struct keywest_iface *iface, reg_t reg, u8 val)
  99 {
 100         out_8(((volatile u8 *)iface->base)
 101                 + (((unsigned)reg) << iface->bsteps), val);
 102         (void)__read_reg(iface, reg);
 103         udelay(10);
 104 }
 105
 106 #define write_reg(reg, val)     __write_reg(iface, reg, val)
 107 #define read_reg(reg)           __read_reg(iface, reg)
 108
 109
 110
 111 #endif /* __I2C_KEYWEST_H__ */