arch/arm/include/debug/omap2plus.S

   1 /*
   2  * Debugging macro include header
   3  *
   4  *  Copyright (C) 1994-1999 Russell King
   5  *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11 */
  12
  13 #include <linux/serial_reg.h>
  14
  15 /* External port on Zoom2/3 */
  16 #define ZOOM_UART_BASE          0x10000000
  17 #define ZOOM_UART_VIRT          0xfa400000
  18
  19 #define OMAP_PORT_SHIFT         2
  20 #define ZOOM_PORT_SHIFT         1
  21
  22 #define UART_OFFSET(addr)       ((addr) & 0x00ffffff)
  23
  24                 .pushsection .data
  25                 .align  2
  26 omap_uart_phys: .word   0
  27 omap_uart_virt: .word   0
  28 omap_uart_lsr:  .word   0
  29                 .popsection
  30
  31                 .macro  addruart, rp, rv, tmp
  32
  33                 /* Use omap_uart_phys/virt if already configured */
  34 10:             adr     \rp, 99f                @ get effective addr of 99f
  35                 ldr     \rv, [\rp]              @ get absolute addr of 99f
  36                 sub     \rv, \rv, \rp           @ offset between the two
  37                 ldr     \rp, [\rp, #4]          @ abs addr of omap_uart_phys
  38                 sub     \tmp, \rp, \rv          @ make it effective
  39                 ldr     \rp, [\tmp, #0]         @ omap_uart_phys
  40                 ldr     \rv, [\tmp, #4]         @ omap_uart_virt
  41                 cmp     \rp, #0                 @ is port configured?
  42                 cmpne   \rv, #0
  43                 bne     100f                    @ already configured
  44
  45                 /* Configure the UART offset from the phys/virt base */
  46 #ifdef CONFIG_DEBUG_ZOOM_UART
  47                 ldr     \rp, =ZOOM_UART_BASE
  48                 str     \rp, [\tmp, #0]         @ omap_uart_phys
  49                 ldr     \rp, =ZOOM_UART_VIRT
  50                 str     \rp, [\tmp, #4]         @ omap_uart_virt
  51                 mov     \rp, #(UART_LSR << ZOOM_PORT_SHIFT)
  52                 str     \rp, [\tmp, #8]         @ omap_uart_lsr
  53 #endif
  54                 b       10b
  55
  56                 .align
  57 99:             .word   .
  58                 .word   omap_uart_phys
  59                 .ltorg
  60
  61 100:            /* Pass the UART_LSR reg address */
  62                 ldr     \tmp, [\tmp, #8]        @ omap_uart_lsr
  63                 add     \rp, \rp, \tmp
  64                 add     \rv, \rv, \tmp
  65                 .endm
  66
  67                 .macro  senduart,rd,rx
  68                 orr     \rd, \rd, \rx, lsl #24  @ preserve LSR reg offset
  69                 bic     \rx, \rx, #0xff         @ get base (THR) reg address
  70                 strb    \rd, [\rx]              @ send lower byte of rd
  71                 orr     \rx, \rx, \rd, lsr #24  @ restore original rx (LSR)
  72                 bic     \rd, \rd, #(0xff << 24) @ restore original rd
  73                 .endm
  74
  75                 .macro  busyuart,rd,rx
  76 1001:           ldrb    \rd, [\rx]              @ rx contains UART_LSR address
  77                 and     \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
  78                 teq     \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
  79                 bne     1001b
  80                 .endm
  81
  82                 .macro  waituart,rd,rx
  83                 .endm