kernel/arch/arm/include/debug/sti.S

   1 /*
   2  * arch/arm/include/debug/sti.S
   3  *
   4  * Debugging macro include header
   5  * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #define STIH41X_COMMS_BASE              0xfed00000
  13 #define STIH41X_ASC2_BASE               (STIH41X_COMMS_BASE+0x32000)
  14
  15 #define STIH41X_SBC_LPM_BASE            0xfe400000
  16 #define STIH41X_SBC_COMMS_BASE          (STIH41X_SBC_LPM_BASE + 0x100000)
  17 #define STIH41X_SBC_ASC1_BASE           (STIH41X_SBC_COMMS_BASE + 0x31000)
  18
  19
  20 #define VIRT_ADDRESS(x)         (x - 0x1000000)
  21
  22 #if IS_ENABLED(CONFIG_STIH41X_DEBUG_ASC2)
  23 #define DEBUG_LL_UART_BASE      STIH41X_ASC2_BASE
  24 #endif
  25
  26 #if IS_ENABLED(CONFIG_STIH41X_DEBUG_SBC_ASC1)
  27 #define DEBUG_LL_UART_BASE      STIH41X_SBC_ASC1_BASE
  28 #endif
  29
  30 #ifndef DEBUG_LL_UART_BASE
  31 #error "DEBUG UART is not Configured"
  32 #endif
  33
  34 #define ASC_TX_BUF_OFF  0x04
  35 #define ASC_CTRL_OFF    0x0c
  36 #define ASC_STA_OFF     0x14
  37
  38 #define ASC_STA_TX_FULL         (1<<9)
  39 #define ASC_STA_TX_EMPTY        (1<<1)
  40
  41
  42                 .macro  addruart, rp, rv, tmp
  43                 ldr     \rp,      =DEBUG_LL_UART_BASE   @ physical base
  44                 ldr     \rv,      =VIRT_ADDRESS(DEBUG_LL_UART_BASE) @ virt base
  45                 .endm
  46
  47                 .macro  senduart,rd,rx
  48                 strb    \rd, [\rx, #ASC_TX_BUF_OFF]
  49                 .endm
  50
  51                 .macro  waituart,rd,rx
  52 1001:           ldr     \rd, [\rx, #ASC_STA_OFF]
  53                 tst     \rd, #ASC_STA_TX_FULL
  54                 bne     1001b
  55                 .endm
  56
  57                 .macro  busyuart,rd,rx
  58 1001:           ldr     \rd, [\rx, #ASC_STA_OFF]
  59                 tst     \rd, #ASC_STA_TX_EMPTY
  60                 beq     1001b
  61                 .endm