root/drivers/i2c/busses/i2c-ibm_iic.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * drivers/i2c/busses/i2c-ibm_iic.h
   4  *
   5  * Support for the IIC peripheral on IBM PPC 4xx
   6  *
   7  * Copyright (c) 2003 Zultys Technologies.
   8  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
   9  *
  10  * Based on original work by
  11  *      Ian DaSilva  <idasilva@mvista.com>
  12  *      Armin Kuster <akuster@mvista.com>
  13  *      Matt Porter  <mporter@mvista.com>
  14  *
  15  *      Copyright 2000-2003 MontaVista Software Inc.
  16  */
  17 #ifndef __I2C_IBM_IIC_H_
  18 #define __I2C_IBM_IIC_H_
  19 
  20 #include <linux/i2c.h>
  21 
  22 struct iic_regs {
  23         u16 mdbuf;
  24         u16 sbbuf;
  25         u8 lmadr;
  26         u8 hmadr;
  27         u8 cntl;
  28         u8 mdcntl;
  29         u8 sts;
  30         u8 extsts;
  31         u8 lsadr;
  32         u8 hsadr;
  33         u8 clkdiv;
  34         u8 intmsk;
  35         u8 xfrcnt;
  36         u8 xtcntlss;
  37         u8 directcntl;
  38 };
  39 
  40 struct ibm_iic_private {
  41         struct i2c_adapter adap;
  42         volatile struct iic_regs __iomem *vaddr;
  43         wait_queue_head_t wq;
  44         int idx;
  45         int irq;
  46         int fast_mode;
  47         u8  clckdiv;
  48 };
  49 
  50 /* IICx_CNTL register */
  51 #define CNTL_HMT        0x80
  52 #define CNTL_AMD        0x40
  53 #define CNTL_TCT_MASK   0x30
  54 #define CNTL_TCT_SHIFT  4
  55 #define CNTL_RPST       0x08
  56 #define CNTL_CHT        0x04
  57 #define CNTL_RW         0x02
  58 #define CNTL_PT         0x01
  59 
  60 /* IICx_MDCNTL register */
  61 #define MDCNTL_FSDB     0x80
  62 #define MDCNTL_FMDB     0x40
  63 #define MDCNTL_EGC      0x20
  64 #define MDCNTL_FSM      0x10
  65 #define MDCNTL_ESM      0x08
  66 #define MDCNTL_EINT     0x04
  67 #define MDCNTL_EUBS     0x02
  68 #define MDCNTL_HSCL     0x01
  69 
  70 /* IICx_STS register */
  71 #define STS_SSS         0x80
  72 #define STS_SLPR        0x40
  73 #define STS_MDBS        0x20
  74 #define STS_MDBF        0x10
  75 #define STS_SCMP        0x08
  76 #define STS_ERR         0x04
  77 #define STS_IRQA        0x02
  78 #define STS_PT          0x01
  79 
  80 /* IICx_EXTSTS register */
  81 #define EXTSTS_IRQP     0x80
  82 #define EXTSTS_BCS_MASK 0x70
  83 #define   EXTSTS_BCS_FREE  0x40
  84 #define EXTSTS_IRQD     0x08
  85 #define EXTSTS_LA       0x04
  86 #define EXTSTS_ICT      0x02
  87 #define EXTSTS_XFRA     0x01
  88 
  89 /* IICx_INTRMSK register */
  90 #define INTRMSK_EIRC    0x80
  91 #define INTRMSK_EIRS    0x40
  92 #define INTRMSK_EIWC    0x20
  93 #define INTRMSK_EIWS    0x10
  94 #define INTRMSK_EIHE    0x08
  95 #define INTRMSK_EIIC    0x04
  96 #define INTRMSK_EITA    0x02
  97 #define INTRMSK_EIMTC   0x01
  98 
  99 /* IICx_XFRCNT register */
 100 #define XFRCNT_MTC_MASK 0x07
 101 
 102 /* IICx_XTCNTLSS register */
 103 #define XTCNTLSS_SRC    0x80
 104 #define XTCNTLSS_SRS    0x40
 105 #define XTCNTLSS_SWC    0x20
 106 #define XTCNTLSS_SWS    0x10
 107 #define XTCNTLSS_SRST   0x01
 108 
 109 /* IICx_DIRECTCNTL register */
 110 #define DIRCNTL_SDAC    0x08
 111 #define DIRCNTL_SCC     0x04
 112 #define DIRCNTL_MSDA    0x02
 113 #define DIRCNTL_MSC     0x01
 114 
 115 /* Check if we really control the I2C bus and bus is free */
 116 #define DIRCTNL_FREE(v) (((v) & 0x0f) == 0x0f)
 117 
 118 #endif /* __I2C_IBM_IIC_H_ */