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 #ifdef CONFIG_MMU
  13 #define AT91_IO_P2V(x) ((x) - 0x01000000)
  14 #else
  15 #define AT91_IO_P2V(x) (x)
  16 #endif
  17
  18 #define CONFIG_DEBUG_UART_VIRT AT91_IO_P2V(CONFIG_DEBUG_UART_PHYS)
  19
  20 #define AT91_DBGU_SR            (0x14)  /* Status Register */
  21 #define AT91_DBGU_THR           (0x1c)  /* Transmitter Holding Register */
  22 #define AT91_DBGU_TXRDY         (1 << 1)        /* Transmitter Ready */
  23 #define AT91_DBGU_TXEMPTY       (1 << 9)        /* Transmitter Empty */
  24
  25         .macro  addruart, rp, rv, tmp
  26         ldr     \rp, =CONFIG_DEBUG_UART_PHYS            @ System peripherals (phys address)
  27         ldr     \rv, =CONFIG_DEBUG_UART_VIRT            @ System peripherals (virt address)
  28         .endm
  29
  30         .macro  senduart,rd,rx
  31         strb    \rd, [\rx, #(AT91_DBGU_THR)]            @ Write to Transmitter Holding Register
  32         .endm
  33
  34         .macro  waituart,rd,rx
  35 1001:   ldr     \rd, [\rx, #(AT91_DBGU_SR)]             @ Read Status Register
  36         tst     \rd, #AT91_DBGU_TXRDY                   @ DBGU_TXRDY = 1 when ready to transmit
  37         beq     1001b
  38         .endm
  39
  40         .macro  busyuart,rd,rx
  41 1001:   ldr     \rd, [\rx, #(AT91_DBGU_SR)]             @ Read Status Register
  42         tst     \rd, #AT91_DBGU_TXEMPTY                 @ DBGU_TXEMPTY = 1 when transmission complete
  43         beq     1001b
  44         .endm
  45