kernel/arch/unicore32/kernel/debug-macro.S

   1 /*
   2  * linux/arch/unicore32/kernel/debug-macro.S
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * Debugging macro include header
  13  */
  14 #include <generated/asm-offsets.h>
  15 #include <mach/hardware.h>
  16
  17                 .macro  put_word_ocd, rd, rx=r16
  18 1001:           movc            \rx, p1.c0, #0
  19                 cand.a  \rx, #2
  20                 bne     1001b
  21                 movc            p1.c1, \rd, #1
  22                 .endm
  23
  24 #ifdef CONFIG_DEBUG_OCD
  25                 /* debug using UniCore On-Chip-Debugger */
  26                 .macro  addruart, rx
  27                 .endm
  28
  29                 .macro  senduart, rd, rx
  30                 put_word_ocd    \rd, \rx
  31                 .endm
  32
  33                 .macro  busyuart, rd, rx
  34                 .endm
  35
  36                 .macro  waituart, rd, rx
  37                 .endm
  38 #else
  39 #define UART_CLK_DEFAULT        3686400 * 20
  40         /* Uartclk = MCLK/ 2, The MCLK on my board is 3686400 * 40  */
  41 #define BAUD_RATE_DEFAULT       115200
  42         /* The baud rate of the serial port */
  43
  44 #define UART_DIVISOR_DEFAULT    (UART_CLK_DEFAULT \
  45                                 / (16 * BAUD_RATE_DEFAULT) - 1)
  46
  47                 .macro  addruart,rx
  48                 mrc     p0, #0, \rx, c1, c0
  49                 tst     \rx, #1                 @ MMU enabled?
  50                 moveq   \rx, #0xee000000        @ physical base address
  51                 movne   \rx, #0x6e000000        @ virtual address
  52
  53                 @ We probe for the active serial port here
  54                 @ However, now we assume UART0 is active:       epip4d
  55                 @ We assume r1 and r2 can be clobbered.
  56
  57                 movl    r2, #UART_DIVISOR_DEFAULT
  58                 mov     r1, #0x80
  59                 str     r1, [\rx, #UART_LCR_OFFSET]
  60                 and     r1, r2, #0xff00
  61                 mov     r1, r1, lsr #8
  62                 str     r1, [\rx, #UART_DLH_OFFSET]
  63                 and     r1, r2, #0xff
  64                 str     r1, [\rx, #UART_DLL_OFFSET]
  65                 mov     r1, #0x7
  66                 str     r1, [\rx, #UART_FCR_OFFSET]
  67                 mov     r1, #0x3
  68                 str     r1, [\rx, #UART_LCR_OFFSET]
  69                 mov     r1, #0x0
  70                 str     r1, [\rx, #UART_IER_OFFSET]
  71                 .endm
  72
  73                 .macro  senduart,rd,rx
  74                 str     \rd, [\rx, #UART_THR_OFFSET]
  75                 .endm
  76
  77                 .macro  waituart,rd,rx
  78 1001:           ldr     \rd, [\rx, #UART_LSR_OFFSET]
  79                 tst     \rd, #UART_LSR_THRE
  80                 beq     1001b
  81                 .endm
  82
  83                 .macro  busyuart,rd,rx
  84 1001:           ldr     \rd, [\rx, #UART_LSR_OFFSET]
  85                 tst     \rd, #UART_LSR_TEMT
  86                 bne     1001b
  87                 .endm
  88 #endif
  89