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 /* Keep in sync with mach-at91/include/mach/hardware.h */
  22 #define AT91_IO_P2V(x) ((x) - 0x01000000)
  23
  24 #define AT91_DBGU_SR            (0x14)  /* Status Register */
  25 #define AT91_DBGU_THR           (0x1c)  /* Transmitter Holding Register */
  26 #define AT91_DBGU_TXRDY         (1 << 1)        /* Transmitter Ready */
  27 #define AT91_DBGU_TXEMPTY       (1 << 9)        /* Transmitter Empty */
  28
  29         .macro  addruart, rp, rv, tmp
  30         ldr     \rp, =AT91_DBGU                         @ System peripherals (phys address)
  31         ldr     \rv, =AT91_IO_P2V(AT91_DBGU)            @ System peripherals (virt address)
  32         .endm
  33
  34         .macro  senduart,rd,rx
  35         strb    \rd, [\rx, #(AT91_DBGU_THR)]            @ Write to Transmitter Holding Register
  36         .endm
  37
  38         .macro  waituart,rd,rx
  39 1001:   ldr     \rd, [\rx, #(AT91_DBGU_SR)]             @ Read Status Register
  40         tst     \rd, #AT91_DBGU_TXRDY                   @ DBGU_TXRDY = 1 when ready to transmit
  41         beq     1001b
  42         .endm
  43
  44         .macro  busyuart,rd,rx
  45 1001:   ldr     \rd, [\rx, #(AT91_DBGU_SR)]             @ Read Status Register
  46         tst     \rd, #AT91_DBGU_TXEMPTY                 @ DBGU_TXEMPTY = 1 when transmission complete
  47         beq     1001b
  48         .endm
  49