arch/arm/mach-davinci/include/mach/debug-macro.S

   1 /*
   2  * Debugging macro for DaVinci
   3  *
   4  * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
   5  *
   6  * 2007 (c) MontaVista Software, Inc. This file is licensed under
   7  * the terms of the GNU General Public License version 2. This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  */
  11
  12 /* Modifications
  13  * Jan 2009     Chaithrika U S  Added senduart, busyuart, waituart
  14  *                              macros, based on debug-8250.S file
  15  *                              but using 32-bit accesses required for
  16  *                              some davinci devices.
  17  */
  18
  19 #include <linux/serial_reg.h>
  20 #define UART_SHIFT      2
  21
  22                 .macro addruart, rx
  23                 mrc     p15, 0, \rx, c1, c0
  24                 tst     \rx, #1                 @ MMU enabled?
  25                 moveq   \rx, #0x01000000        @ physical base address
  26                 movne   \rx, #0xfe000000        @ virtual base
  27                 orr     \rx, \rx, #0x00c20000   @ UART 0
  28                 .endm
  29
  30                 .macro  senduart,rd,rx
  31                 str     \rd, [\rx, #UART_TX << UART_SHIFT]
  32                 .endm
  33
  34                 .macro  busyuart,rd,rx
  35 1002:           ldr     \rd, [\rx, #UART_LSR << UART_SHIFT]
  36                 and     \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
  37                 teq     \rd, #UART_LSR_TEMT | UART_LSR_THRE
  38                 bne     1002b
  39                 .endm
  40
  41                 .macro  waituart,rd,rx
  42 #ifdef FLOW_CONTROL
  43 1001:           ldr     \rd, [\rx, #UART_MSR << UART_SHIFT]
  44                 tst     \rd, #UART_MSR_CTS
  45                 beq     1001b
  46 #endif
  47                 .endm
  48