arch/arm/include/debug/at91.S

   1 /*
   2  *  Copyright (C) 2003-2005 SAN People
   3  *
   4  * Debugging macro include header
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10 */
  11
  12 #if defined(CONFIG_AT91_DEBUG_LL_DBGU0)
  13 #define AT91_DBGU 0xfffff200 /* AT91_BASE_DBGU0 */
  14 #elif defined(CONFIG_AT91_DEBUG_LL_DBGU1)
  15 #define AT91_DBGU 0xffffee00 /* AT91_BASE_DBGU1 */
  16 #else
  17 /* On sama5d4, use USART3 as low level serial console */
  18 #define AT91_DBGU 0xfc00c000 /* SAMA5D4_BASE_USART3 */
  19 #endif
  20
  21 #ifdef CONFIG_MMU
  22 #define AT91_IO_P2V(x) ((x) - 0x01000000)
  23 #else
  24 #define AT91_IO_P2V(x) (x)
  25 #endif
  26
  27 #define AT91_DBGU_SR            (0x14)  /* Status Register */
  28 #define AT91_DBGU_THR           (0x1c)  /* Transmitter Holding Register */
  29 #define AT91_DBGU_TXRDY         (1 << 1)        /* Transmitter Ready */
  30 #define AT91_DBGU_TXEMPTY       (1 << 9)        /* Transmitter Empty */
  31
  32         .macro  addruart, rp, rv, tmp
  33         ldr     \rp, =AT91_DBGU                         @ System peripherals (phys address)
  34         ldr     \rv, =AT91_IO_P2V(AT91_DBGU)            @ System peripherals (virt address)
  35         .endm
  36
  37         .macro  senduart,rd,rx
  38         strb    \rd, [\rx, #(AT91_DBGU_THR)]            @ Write to Transmitter Holding Register
  39         .endm
  40
  41         .macro  waituart,rd,rx
  42 1001:   ldr     \rd, [\rx, #(AT91_DBGU_SR)]             @ Read Status Register
  43         tst     \rd, #AT91_DBGU_TXRDY                   @ DBGU_TXRDY = 1 when ready to transmit
  44         beq     1001b
  45         .endm
  46
  47         .macro  busyuart,rd,rx
  48 1001:   ldr     \rd, [\rx, #(AT91_DBGU_SR)]             @ Read Status Register
  49         tst     \rd, #AT91_DBGU_TXEMPTY                 @ DBGU_TXEMPTY = 1 when transmission complete
  50         beq     1001b
  51         .endm
  52