arch/blackfin/include/asm/bfin_twi.h

   1 /*
   2  * bfin_twi.h - interface to Blackfin TWIs
   3  *
   4  * Copyright 2005-2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #ifndef __ASM_BFIN_TWI_H__
  10 #define __ASM_BFIN_TWI_H__
  11
  12 #include <linux/types.h>
  13 #include <linux/i2c.h>
  14
  15 /*
  16  * All Blackfin system MMRs are padded to 32bits even if the register
  17  * itself is only 16bits.  So use a helper macro to streamline this.
  18  */
  19 #define __BFP(m) u16 m; u16 __pad_##m
  20
  21 /*
  22  * bfin twi registers layout
  23  */
  24 struct bfin_twi_regs {
  25         __BFP(clkdiv);
  26         __BFP(control);
  27         __BFP(slave_ctl);
  28         __BFP(slave_stat);
  29         __BFP(slave_addr);
  30         __BFP(master_ctl);
  31         __BFP(master_stat);
  32         __BFP(master_addr);
  33         __BFP(int_stat);
  34         __BFP(int_mask);
  35         __BFP(fifo_ctl);
  36         __BFP(fifo_stat);
  37         u32 __pad[20];
  38         __BFP(xmt_data8);
  39         __BFP(xmt_data16);
  40         __BFP(rcv_data8);
  41         __BFP(rcv_data16);
  42 };
  43
  44 #undef __BFP
  45
  46 struct bfin_twi_iface {
  47         int                     irq;
  48         spinlock_t              lock;
  49         char                    read_write;
  50         u8                      command;
  51         u8                      *transPtr;
  52         int                     readNum;
  53         int                     writeNum;
  54         int                     cur_mode;
  55         int                     manual_stop;
  56         int                     result;
  57         struct i2c_adapter      adap;
  58         struct completion       complete;
  59         struct i2c_msg          *pmsg;
  60         int                     msg_num;
  61         int                     cur_msg;
  62         u16                     saved_clkdiv;
  63         u16                     saved_control;
  64         struct bfin_twi_regs __iomem *regs_base;
  65 };
  66
  67 #define DEFINE_TWI_REG(reg_name, reg) \
  68 static inline u16 read_##reg_name(struct bfin_twi_iface *iface) \
  69         { return bfin_read16(&iface->regs_base->reg); } \
  70 static inline void write_##reg_name(struct bfin_twi_iface *iface, u16 v) \
  71         { bfin_write16(&iface->regs_base->reg, v); }
  72
  73 DEFINE_TWI_REG(CLKDIV, clkdiv)
  74 DEFINE_TWI_REG(CONTROL, control)
  75 DEFINE_TWI_REG(SLAVE_CTL, slave_ctl)
  76 DEFINE_TWI_REG(SLAVE_STAT, slave_stat)
  77 DEFINE_TWI_REG(SLAVE_ADDR, slave_addr)
  78 DEFINE_TWI_REG(MASTER_CTL, master_ctl)
  79 DEFINE_TWI_REG(MASTER_STAT, master_stat)
  80 DEFINE_TWI_REG(MASTER_ADDR, master_addr)
  81 DEFINE_TWI_REG(INT_STAT, int_stat)
  82 DEFINE_TWI_REG(INT_MASK, int_mask)
  83 DEFINE_TWI_REG(FIFO_CTL, fifo_ctl)
  84 DEFINE_TWI_REG(FIFO_STAT, fifo_stat)
  85 DEFINE_TWI_REG(XMT_DATA8, xmt_data8)
  86 DEFINE_TWI_REG(XMT_DATA16, xmt_data16)
  87 #if !ANOMALY_16000030
  88 DEFINE_TWI_REG(RCV_DATA8, rcv_data8)
  89 DEFINE_TWI_REG(RCV_DATA16, rcv_data16)
  90 #else
  91 static inline u16 read_RCV_DATA8(struct bfin_twi_iface *iface)
  92 {
  93         u16 ret;
  94         unsigned long flags;
  95
  96         flags = hard_local_irq_save();
  97         ret = bfin_read16(&iface->regs_base->rcv_data8);
  98         hard_local_irq_restore(flags);
  99
 100         return ret;
 101 }
 102
 103 static inline u16 read_RCV_DATA16(struct bfin_twi_iface *iface)
 104 {
 105         u16 ret;
 106         unsigned long flags;
 107
 108         flags = hard_local_irq_save();
 109         ret = bfin_read16(&iface->regs_base->rcv_data16);
 110         hard_local_irq_restore(flags);
 111
 112         return ret;
 113 }
 114 #endif
 115
 116
 117 /*  ********************  TWO-WIRE INTERFACE (TWI) MASKS  ***********************/
 118 /* TWI_CLKDIV Macros (Use: *pTWI_CLKDIV = CLKLOW(x)|CLKHI(y);  )                                */
 119 #define CLKLOW(x)       ((x) & 0xFF)    /* Periods Clock Is Held Low                    */
 120 #define CLKHI(y)        (((y)&0xFF)<<0x8)       /* Periods Before New Clock Low                 */
 121
 122 /* TWI_PRESCALE Masks                                                                                                                   */
 123 #define PRESCALE        0x007F  /* SCLKs Per Internal Time Reference (10MHz)    */
 124 #define TWI_ENA         0x0080  /* TWI Enable                                                                   */
 125 #define SCCB            0x0200  /* SCCB Compatibility Enable                                    */
 126
 127 /* TWI_SLAVE_CTL Masks                                                                                                                  */
 128 #define SEN                     0x0001  /* Slave Enable                                                                 */
 129 #define SADD_LEN        0x0002  /* Slave Address Length                                                 */
 130 #define STDVAL          0x0004  /* Slave Transmit Data Valid                                    */
 131 #define NAK                     0x0008  /* NAK/ACK* Generated At Conclusion Of Transfer */
 132 #define GEN                     0x0010  /* General Call Address Matching Enabled                */
 133
 134 /* TWI_SLAVE_STAT Masks                                                                                                                 */
 135 #define SDIR            0x0001  /* Slave Transfer Direction (Transmit/Receive*) */
 136 #define GCALL           0x0002  /* General Call Indicator                                               */
 137
 138 /* TWI_MASTER_CTL Masks                                                                                                 */
 139 #define MEN                     0x0001  /* Master Mode Enable                                           */
 140 #define MADD_LEN        0x0002  /* Master Address Length                                        */
 141 #define MDIR            0x0004  /* Master Transmit Direction (RX/TX*)           */
 142 #define FAST            0x0008  /* Use Fast Mode Timing Specs                           */
 143 #define STOP            0x0010  /* Issue Stop Condition                                         */
 144 #define RSTART          0x0020  /* Repeat Start or Stop* At End Of Transfer     */
 145 #define DCNT            0x3FC0  /* Data Bytes To Transfer                                       */
 146 #define SDAOVR          0x4000  /* Serial Data Override                                         */
 147 #define SCLOVR          0x8000  /* Serial Clock Override                                        */
 148
 149 /* TWI_MASTER_STAT Masks                                                                                                                */
 150 #define MPROG           0x0001  /* Master Transfer In Progress                                  */
 151 #define LOSTARB         0x0002  /* Lost Arbitration Indicator (Xfer Aborted)    */
 152 #define ANAK            0x0004  /* Address Not Acknowledged                                             */
 153 #define DNAK            0x0008  /* Data Not Acknowledged                                                */
 154 #define BUFRDERR        0x0010  /* Buffer Read Error                                                    */
 155 #define BUFWRERR        0x0020  /* Buffer Write Error                                                   */
 156 #define SDASEN          0x0040  /* Serial Data Sense                                                    */
 157 #define SCLSEN          0x0080  /* Serial Clock Sense                                                   */
 158 #define BUSBUSY         0x0100  /* Bus Busy Indicator                                                   */
 159
 160 /* TWI_INT_SRC and TWI_INT_ENABLE Masks                                         */
 161 #define SINIT           0x0001  /* Slave Transfer Initiated     */
 162 #define SCOMP           0x0002  /* Slave Transfer Complete      */
 163 #define SERR            0x0004  /* Slave Transfer Error         */
 164 #define SOVF            0x0008  /* Slave Overflow                       */
 165 #define MCOMP           0x0010  /* Master Transfer Complete     */
 166 #define MERR            0x0020  /* Master Transfer Error        */
 167 #define XMTSERV         0x0040  /* Transmit FIFO Service        */
 168 #define RCVSERV         0x0080  /* Receive FIFO Service         */
 169
 170 /* TWI_FIFO_CTRL Masks                                                                                          */
 171 #define XMTFLUSH        0x0001  /* Transmit Buffer Flush                        */
 172 #define RCVFLUSH        0x0002  /* Receive Buffer Flush                         */
 173 #define XMTINTLEN       0x0004  /* Transmit Buffer Interrupt Length     */
 174 #define RCVINTLEN       0x0008  /* Receive Buffer Interrupt Length      */
 175
 176 /* TWI_FIFO_STAT Masks                                                                                                                  */
 177 #define XMTSTAT         0x0003  /* Transmit FIFO Status                                                 */
 178 #define XMT_EMPTY       0x0000  /*              Transmit FIFO Empty                                             */
 179 #define XMT_HALF        0x0001  /*              Transmit FIFO Has 1 Byte To Write               */
 180 #define XMT_FULL        0x0003  /*              Transmit FIFO Full (2 Bytes To Write)   */
 181
 182 #define RCVSTAT         0x000C  /* Receive FIFO Status                                                  */
 183 #define RCV_EMPTY       0x0000  /*              Receive FIFO Empty                                              */
 184 #define RCV_HALF        0x0004  /*              Receive FIFO Has 1 Byte To Read                 */
 185 #define RCV_FULL        0x000C  /*              Receive FIFO Full (2 Bytes To Read)             */
 186
 187 #endif