arch/arm-native/soc/broadcom/2708/hidd/i2c/i2c-bcm2708.c

   1 /*
   2     Copyright © 2010-2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/symbolsets.h>
   7 #include <aros/debug.h>
   8 #include <proto/exec.h>
   9 #include <proto/kernel.h>
  10
  11 #include <hidd/i2c.h>
  12
  13 static IPTR __arm_periiobase;
  14 #define ARM_PERIIOBASE __arm_periiobase
  15 #include <hardware/bcm2708.h>
  16 #include <asm/io.h>
  17
  18 #include "i2c-bcm2708.h"
  19
  20 APTR KernelBase __attribute__((used)) = NULL;
  21
  22 void METHOD(I2CBCM2708, Hidd_I2C, PutByte)
  23 {
  24     while (!((*(volatile UBYTE *)BSC0_STATUS) & BSC_STATUS_DONE))
  25     {
  26         asm volatile ("mov r2,r2\n");
  27     }
  28
  29     *(volatile UBYTE *)BSC0_DATALEN = 1;
  30     *(volatile UBYTE *)BSC0_FIFO = msg->data;
  31
  32     *(volatile UBYTE *)BSC0_STATUS = BSC_CLEAR;
  33     *(volatile UBYTE *)BSC0_CONTROL = BSC_WRITE;
  34 }
  35
  36 void METHOD(I2CBCM2708, Hidd_I2C, GetByte)
  37 {
  38     while (!((*(volatile UBYTE *)BSC0_STATUS) & BSC_STATUS_DONE))
  39     {
  40         asm volatile ("mov r2,r2\n");
  41     }
  42
  43     *(volatile UBYTE *)BSC0_DATALEN = 1;
  44     *(volatile UBYTE *)BSC0_STATUS = BSC_CLEAR;
  45     *(volatile UBYTE *)BSC0_CONTROL = BSC_READ;
  46
  47     *msg->data = *(volatile UBYTE *)BSC0_FIFO;
  48 }
  49
  50 void I2CBCM2708_Init(void)
  51 {
  52     KernelBase = OpenResource("kernel.resource");
  53     __arm_periiobase = KrnGetSystemAttr(KATTR_PeripheralBase);
  54
  55     /* BSC0 is on GPIO 0 & 1 */
  56     *(volatile UBYTE *)GPFSEL0 &= ~0x3f; // Mask out bits 0-5
  57     *(volatile UBYTE *)GPFSEL0 |= 0x24;  // Set bits 0-5 to binary '100100'
  58 }
  59
  60 ADD2LIBS((STRPTR)"i2c.hidd", 0, static struct Library *, I2CBase);