cpu/mpc824x/drivers/i2c/i2c2.S

   1 /**************************************
   2  *
   3  * copyright @ Motorola, 1999
   4  *
   5  **************************************/
   6
   7 #include <config.h>
   8 #ifdef CONFIG_HARD_I2C
   9 #include <ppc_asm.tmpl>
  10 #include <asm/mmu.h>
  11 /**********************************************************
  12  * function: load_runtime_reg
  13  *
  14  * input:  r3 - value of eumbbar
  15  *         r4 - register offset in embedded utility space
  16  *
  17  * output: r3 - register content
  18  **********************************************************/
  19         .text
  20         .align 2
  21         .global load_runtime_reg
  22 load_runtime_reg:
  23
  24 /*      xor r5,r5,r5
  25  *      or  r5,r5,r3
  26  *
  27  *      lwbrx   r3,r4,r5
  28  */
  29         lwbrx r3,r4,r3
  30         sync
  31
  32         bclr 20, 0
  33
  34 /****************************************************************
  35  * function: store_runtime_reg
  36  *
  37  * input: r3 - value of eumbbar
  38  *        r4 - register offset in embedded utility space
  39  *        r5 - new value to be stored
  40  *
  41  ****************************************************************/
  42         .text
  43         .align 2
  44         .global store_runtime_reg
  45 store_runtime_reg:
  46
  47         stwbrx r5,  r4, r3
  48         sync
  49
  50         bclr   20,0
  51
  52 #endif /* CONFIG_HARD_I2C */