1 files changed, 108 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-keywest.h b/drivers/i2c/busses/i2c-keywest.h
new file mode 100644
index 000000000000..c5022e1ca6ff
--- /dev/null
+++ b/drivers/i2c/busses/i2c-keywest.h
@@ -0,0 +1,108 @@
+#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__ */